Let's be honest. Stopping a job to troubleshoot a tool in the middle of a fence line is frustrating. But the good news is that most pneumatic post driver problems come down to three simple things: air supply, lubrication, or adapter fit.
Before you assume your driver is broken, check the compressor, air hose, inline oiler, and O-rings. An air tool that seems dead is usually just dirty or dry. A thorough cleaning and a proper oiling brings most of them right back to life.
A pneumatic post driver (also called an air powered or air operated post driver) is a beautifully simple, rugged tool. The Man Saver pneumatic post driver has been built in Prineville, Oregon, since 1997. It is a highly portable post driver that runs off a standard compact air compressor. But simple does not mean maintenance-free. It requires the right air pressure, clean lines, and regular oil to hit hard on every single stroke.
This pneumatic post driver troubleshooting guide covers the primary problems crews run into when driving posts for fence installation contracts, T-post driving for farm fencing, heavy-duty ranch fencing, rugged construction site boundaries, and public works sign posts.
Quick Pneumatic Post Driver Troubleshooting Checklist
Short Answer: If your pneumatic post driver is not working properly, check the air supply first. Confirm your compressor pressure, air volume (CFM), air hose, and fittings. Then check the oil and the O-rings. Most weak, slow, or sticking drivers are simply short on air, short on oil, or running on dirty O-rings.
Safety first: Always disconnect the air hose before you inspect, clean, or adjust anything. Never dry fire the tool. Only run the driver with a post firmly clamped in the sleeve, and always wear eye, ear, and foot protection.
Work through these steps in order to diagnose your tool quickly:
-
Set the compressor to your model's exact design pressure (see the pressure table below).
-
Confirm the compressor puts out enough air volume. Man Saver drivers require at least 2.5 CFM, and up to 3.5 CFM for the larger commercial models.
-
Check the air hose for kinks, severe leaks, or unnecessary length.
-
Ensure every brass fitting and air coupler is tight and fully seated.
-
Oil the tool and check that your inline oiler has fluid in it.
-
Drain trapped water from the bottom of your compressor tank.
-
Inspect the O-rings to see if they are dirty, dry, or cracked.
-
Clean the speed control orifice (the small exhaust opening on the driver body).
-
Tighten the clamp handle so the sleeve firmly grips the post.
-
Confirm you are using the correct adapter or sleeve for the specific post shape.
-
Stop using the tool immediately if you see visible cracks, bent metal, or severe damage.
Problem 1: Pneumatic Post Driver Has Low Power
When your post driver feels weak, it does not necessarily mean the tool is defective. Most of the time, the compressor simply cannot keep up, or the air is being choked before it even reaches the driver.
First, do a quick physical check. If the driver is running but the post is not moving at all, the sleeve is probably slipping. Tighten the clamp handle snugly (but do not over-tighten) and try again.
If it is still weak, check your air supply. Your compressor regulator might be set below your model's design pressure, or the compressor itself might lack the necessary CFM output. A classic sign of low CFM is a driver that hits hard for the first few seconds and then fades. Using a hose that is too long or too narrow will also restrict airflow. Brush soapy water on each fitting to check for air leaks (bubbles mean a leak). Finally, if the ground is exceptionally hard, refer to our guide on driving posts in hard rocky soil for proper pilot hole techniques.
Problem 2: Pneumatic Post Driver Will Not Fire
If your driver will not start, the issue is usually a blocked air supply or a stuck valve. Remember that Man Saver drivers do not use a trigger mechanism. You start them by moving the control lever down to ON, and you stop them by moving it up to OFF.
First, check the gauge on your compressor to ensure it is building back up to pressure. Reconnect your air coupler, pushing it until it seats fully, and straighten out any kinks in the hose.
If air is reaching the tool but it still refuses to fire, the control valve is likely stuck because the tool is dry. Disconnect the air, drop a generous amount of oil directly into the center hole on the valve body, and manually move the control lever down and up several times to free the mechanism. If the driver stalled after hitting solid rock, do not keep trying to hammer through it. Move the post location slightly to the left or right and try again.
Problem 3: Air Is Leaking from the Post Driver
Short Answer: Air leaks in a pneumatic post driver are commonly caused by loose brass fittings, damaged couplers, or worn O-rings that need immediate replacement.
A small air leak drains power from every stroke, while a major leak can stop the driver completely. Leaks usually stem from loose brass fittings between the valve body and the cylinder, damaged quick-connect couplers, or dried-out O-rings.
Disconnect the air before you begin working on the tool. Snug up any loose fittings carefully. Brass strips easily, so apply firm pressure without overtightening. If you suspect an internal leak, replace the worn O-rings with a fresh kit from Rohrer's replacement parts collection. Make sure you clean all grit and dirt away from the connection points before reassembling the unit.
Problem 4: Driver Is Sticking or Not Cycling Smoothly
Pneumatic drivers require steady lubrication to cycle smoothly. Running the tool dry increases friction, drastically lowers your driving power, and accelerates internal wear.
A healthy Man Saver should run at about 80 to 85 strokes a minute (roughly 20 strokes in 15 seconds). Count them while you work. If you are well under that pace, or the rhythm sounds uneven, the tool is likely running dry or suffering from water contamination. Drain the compressor tank before every use to prevent condensation from washing the protective oil out of the cylinder.
If you are working in cold weather, the existing lubricant on the O-rings can stiffen up. Disconnect the air line, pour Lube Oil into the valve, and manually work the lever to loosen the parts.
Problem 5: Post Driver Is Using Too Much Air
Man Saver drivers are built to sip air efficiently, running optimally on just 2.5 to 3.5 CFM. If your compressor used to keep up perfectly but is suddenly falling behind, something has changed in your setup.
A sudden spike in air consumption almost always points to a leak between the compressor and the tool, or worn O-rings allowing air to slip past the piston inside the cylinder. Do the soapy water test on every fitting to locate hidden leaks. Ensure your compressor is actually rated to deliver the necessary output at 90 PSI. If your air consumption jumped suddenly in the middle of a job, stop operating the tool to prevent further internal damage.
Problem 6: Post Driver Works Slowly
Slow driving usually indicates that your air supply is dropping off mid-job, or the exhaust cannot clear fast enough. Watch the compressor gauge closely while you drive a post. If the needle keeps falling, you have found your problem.
Your air tank might be too small for steady continuous work, or the compressor recovery time is too slow. If upgrading the compressor is not an option, you will need to pause periodically to let the tank catch up. You should also check the small speed control orifice on the exhaust port to ensure it is not packed with dirt, which prevents the driver from cycling quickly. For more detailed advice, read our air compressor requirements for pneumatic post drivers guide.
Problem 7: Driver Is Damaging the Post
When posts end up bent, flared, or mushroomed at the top, the issue is almost always a sloppy fit. You must match the driver to the post size first, and then use the correct adapter sleeve to keep the impact dead-centered.
If you are running the standard lightweight 98-E T-Post Driver, it is already optimized for standard agricultural T-posts. However, if you are driving round galvanized pipe, you need to match your post diameter to the correct commercial unit. The 91-R Post Driver handles up to 2-3/8" outer diameter pipe, the 93-R Post Driver handles up to 2-7/8", and the heavy-duty 95-R Post Driver accommodates up to 3-1/2".
Check that your posts are actually thick-walled and designed to be driven. If a post goes in crooked or gets bent, do not leave it. Pull it cleanly with a heavy-duty T-post puller and reset it. For help sizing your equipment correctly, review our comprehensive post driver size guide.
Problem 8: Driver Is Hard to Control
A post driver that bucks or wanders usually suffers from too much play between the sleeve and the post, or it was started at an awkward angle. Expect the tool to move fast. On every single stroke, the handle and body will lift roughly 7 inches before driving down.
Use the correct adapter so the post fits snugly in the sleeve. Slide the post all the way up into the driver barrel before you snug the clamp handle. Stand the driver straight up, establish a firm footing, and keep a relaxed hand on the driver handle so you do not fight the machine's natural rhythm. Start slowly, and stop to re-square the post immediately if it begins to lean.
Compressor Setup Issues
A pneumatic post driver can only perform as well as the air system standing behind it. Do not run the tool above your model's design range. Excessive pressure forces the O-rings to fail prematurely and voids your warranty.
-
98-E T-Post Driver: 70 to 75 PSI
-
91-R Post Driver: 80 to 90 PSI
-
93-R Post Driver: 90 to 100 PSI
-
95-R Post Driver: 90 to 110 PSI
Contractor Note: If you regularly work in tough soil and need more speed, consider adding the High-Pressure Upgrade Kit to your setup. This kit includes an in-line regulator and new air tube designed to let your driver run unregulated up to 130 PSI, increasing performance up to 130 strokes per minute.
Always use an air hose with at least a 3/8-inch inside diameter, and keep the hose as short as possible. Thin or overly long hoses choke the airflow before it reaches the tool.
Lubrication and Maintenance Tips
Short Answer: Regular oiling is the single most important maintenance step for a pneumatic post driver. Proper oiling cuts friction, protects the O-rings, and keeps the internal piston cycling smoothly.
We highly recommend using Rohrer Lube Oil or a quality air tool oil. Per the Man Saver manual, you can also use 20-weight hydraulic oil or standard 5W-30 motor oil.
The easiest way to maintain your tool is to install an inline oiler in your air setup. It automatically feeds a fine mist of oil into the air stream as you work. If you do not have an oiler, pour 3 to 4 tablespoons of oil directly into the air hose at the compressor end before you start your shift. Never run the driver dry, and always store the tool in a clean, dry place with the air inlet covered.
When to Replace Parts
If you have checked the air supply, oiled the tool thoroughly, and it still lacks power, an internal wear part has likely reached the end of its lifespan. Look for persistent air leaks, weak performance even with high CFM, or O-rings that appear flattened and dried out.
Replace worn parts immediately before they cause larger mechanical failures. You can find the right part number on the parts diagram for your model. We stock a full inventory of post driver parts and post driver accessories to ensure your tool stays out in the field.
When to Contact Support
If basic troubleshooting does not fix the problem, call us before you continue to run the tool. Operating a damaged pneumatic post driver will only compound the damage.
Contact our technical support team if air leaks continue after replacing the seals, if internal parts look physically damaged, or if the driver completely refuses to cycle under proper pressure. All Man Saver post drivers are protected by a 90-Day Limited Warranty against manufacturing defects. Note that operator errors, such as dry-firing or exceeding recommended air pressure limits, are not covered under warranty, so proper daily maintenance is key.
If you have questions, reach out through our contact form or call technical support directly. When you call, you speak directly to the people who build and service these tools in Oregon.
Final Troubleshooting Summary
Most pneumatic post driver problems are caused by restricted air supply, lack of lubrication, loose fittings, or the wrong adapter setup. Start by checking your compressor output, hose diameter, oiling routine, and adapter fit before you assume the driver needs a major mechanical repair.
With the right setup and consistent care, a pneumatic fence post driver will remain one of the most dependable fence installation tools in your truck.
Compare Your Tool Options:
Pneumatic Post Driver Troubleshooting FAQs
How do you troubleshoot a pneumatic post driver?
Start with the air supply. Check your compressor pressure, CFM output, air hose diameter, and fittings. Oil the tool, check the O-rings, clean the exhaust orifice, and tighten the clamp. Finally, confirm you are using the correct adapter for the post.
Why is my pneumatic post driver weak?
A weak driver is usually short on air or short on oil. The compressor may not supply enough CFM, the pressure regulator may be set too low, the hose may be too restrictive, or there may be an air leak. If the driver runs rapidly but the post does not move, securely tighten the clamp handle.
Why won't my pneumatic post driver fire?
Usually, no air is reaching the tool, or the valve is stuck dry. Check that the compressor is at full pressure and the coupler is fully seated. If the tool is dry, oil the center hole on the valve body and work the control lever up and down manually. If it stalled on solid rock, move the post slightly and try again.
Why is air leaking from my post driver?
Most leaks are caused by loose brass fittings, damaged quick-connect couplers, worn O-rings, or dirt keeping the internal parts from sealing perfectly.
How often should I oil a pneumatic post driver?
You must oil the driver every single day you use it. Run an inline oiler during use for the best results. Without an oiler, add 3 to 4 tablespoons of oil into the air hose at the compressor end before you start working.
What kind of oil should I use in a pneumatic post driver?
For Man Saver drivers, we highly recommend Rohrer Lube Oil or a quality air tool oil. Per the owner's manual, you may also use 20-weight hydraulic oil or 5W-30 motor oil.
Why does my post driver keep sticking?
A driver usually sticks because it is dry, dirty, wet inside from line condensation, or running in freezing weather. Worn O-rings, a worn valve spool, or a clogged speed control orifice can also restrict movement.
What air compressor do I need for a pneumatic post driver?
Man Saver drivers need a minimum of 2.5 CFM, and the heavy-duty 95-R requires 3.5 CFM. Choose a compressor that provides about 50% more than that rating so it does not run continuously. A 5.5 HP portable gas compressor usually does the job well.
Can the wrong air compressor damage a pneumatic post driver?
A compressor that is too small will leave the driver weak and slow. However, running an oversized compressor above the tool's design pressure can blow out O-rings and void the warranty. Additionally, wet air from an undrained tank washes out protective oil and speeds up internal rust.
What PSI does a pneumatic post driver need?
It depends on the specific model. Man Saver drivers range from 70 to 75 PSI for the 98-E, up to 90 to 110 PSI for the commercial 95-R. Unless you have installed the High-Pressure Upgrade Kit, you must stay within these factory limits.
Why is my pneumatic post driver damaging posts?
The usual causes are using the wrong adapter sleeve, running a driver that is too big for the post, driving a thin-walled post, a crooked start, or continuously hammering after the post hits impenetrable rock.
When should I replace O-rings or seals?
Replace them when air leaks keep coming back, when the driver stays weak or sticky after a full cleaning and oiling, or when the rubber looks visibly cracked, flat, or dried out.
Pneumatic Post Driver Troubleshooting: Common Problems and Fixes
Let's be honest. Stopping a job to troubleshoot a tool in the middle of a fence line is frustrating. But the good news is that most pneumatic post driver problems come down to three simple things: air supply, lubrication, or adapter fit.
Before you assume your driver is broken, check the compressor, air hose, inline oiler, and O-rings. An air tool that seems dead is usually just dirty or dry. A thorough cleaning and a proper oiling brings most of them right back to life.
A pneumatic post driver (also called an air powered or air operated post driver) is a beautifully simple, rugged tool. The Man Saver pneumatic post driver has been built in Prineville, Oregon, since 1997. It is a highly portable post driver that runs off a standard compact air compressor. But simple does not mean maintenance-free. It requires the right air pressure, clean lines, and regular oil to hit hard on every single stroke.
This pneumatic post driver troubleshooting guide covers the primary problems crews run into when driving posts for fence installation contracts, T-post driving for farm fencing, heavy-duty ranch fencing, rugged construction site boundaries, and public works sign posts.
Quick Pneumatic Post Driver Troubleshooting Checklist
Short Answer: If your pneumatic post driver is not working properly, check the air supply first. Confirm your compressor pressure, air volume (CFM), air hose, and fittings. Then check the oil and the O-rings. Most weak, slow, or sticking drivers are simply short on air, short on oil, or running on dirty O-rings.
Safety first: Always disconnect the air hose before you inspect, clean, or adjust anything. Never dry fire the tool. Only run the driver with a post firmly clamped in the sleeve, and always wear eye, ear, and foot protection.
Work through these steps in order to diagnose your tool quickly:
Set the compressor to your model's exact design pressure (see the pressure table below).
Confirm the compressor puts out enough air volume. Man Saver drivers require at least 2.5 CFM, and up to 3.5 CFM for the larger commercial models.
Check the air hose for kinks, severe leaks, or unnecessary length.
Ensure every brass fitting and air coupler is tight and fully seated.
Oil the tool and check that your inline oiler has fluid in it.
Drain trapped water from the bottom of your compressor tank.
Inspect the O-rings to see if they are dirty, dry, or cracked.
Clean the speed control orifice (the small exhaust opening on the driver body).
Tighten the clamp handle so the sleeve firmly grips the post.
Confirm you are using the correct adapter or sleeve for the specific post shape.
Stop using the tool immediately if you see visible cracks, bent metal, or severe damage.
Problem 1: Pneumatic Post Driver Has Low Power
When your post driver feels weak, it does not necessarily mean the tool is defective. Most of the time, the compressor simply cannot keep up, or the air is being choked before it even reaches the driver.
First, do a quick physical check. If the driver is running but the post is not moving at all, the sleeve is probably slipping. Tighten the clamp handle snugly (but do not over-tighten) and try again.
If it is still weak, check your air supply. Your compressor regulator might be set below your model's design pressure, or the compressor itself might lack the necessary CFM output. A classic sign of low CFM is a driver that hits hard for the first few seconds and then fades. Using a hose that is too long or too narrow will also restrict airflow. Brush soapy water on each fitting to check for air leaks (bubbles mean a leak). Finally, if the ground is exceptionally hard, refer to our guide on driving posts in hard rocky soil for proper pilot hole techniques.
Problem 2: Pneumatic Post Driver Will Not Fire
If your driver will not start, the issue is usually a blocked air supply or a stuck valve. Remember that Man Saver drivers do not use a trigger mechanism. You start them by moving the control lever down to ON, and you stop them by moving it up to OFF.
First, check the gauge on your compressor to ensure it is building back up to pressure. Reconnect your air coupler, pushing it until it seats fully, and straighten out any kinks in the hose.
If air is reaching the tool but it still refuses to fire, the control valve is likely stuck because the tool is dry. Disconnect the air, drop a generous amount of oil directly into the center hole on the valve body, and manually move the control lever down and up several times to free the mechanism. If the driver stalled after hitting solid rock, do not keep trying to hammer through it. Move the post location slightly to the left or right and try again.
Problem 3: Air Is Leaking from the Post Driver
Short Answer: Air leaks in a pneumatic post driver are commonly caused by loose brass fittings, damaged couplers, or worn O-rings that need immediate replacement.
A small air leak drains power from every stroke, while a major leak can stop the driver completely. Leaks usually stem from loose brass fittings between the valve body and the cylinder, damaged quick-connect couplers, or dried-out O-rings.
Disconnect the air before you begin working on the tool. Snug up any loose fittings carefully. Brass strips easily, so apply firm pressure without overtightening. If you suspect an internal leak, replace the worn O-rings with a fresh kit from Rohrer's replacement parts collection. Make sure you clean all grit and dirt away from the connection points before reassembling the unit.
Problem 4: Driver Is Sticking or Not Cycling Smoothly
Pneumatic drivers require steady lubrication to cycle smoothly. Running the tool dry increases friction, drastically lowers your driving power, and accelerates internal wear.
A healthy Man Saver should run at about 80 to 85 strokes a minute (roughly 20 strokes in 15 seconds). Count them while you work. If you are well under that pace, or the rhythm sounds uneven, the tool is likely running dry or suffering from water contamination. Drain the compressor tank before every use to prevent condensation from washing the protective oil out of the cylinder.
If you are working in cold weather, the existing lubricant on the O-rings can stiffen up. Disconnect the air line, pour Lube Oil into the valve, and manually work the lever to loosen the parts.
Problem 5: Post Driver Is Using Too Much Air
Man Saver drivers are built to sip air efficiently, running optimally on just 2.5 to 3.5 CFM. If your compressor used to keep up perfectly but is suddenly falling behind, something has changed in your setup.
A sudden spike in air consumption almost always points to a leak between the compressor and the tool, or worn O-rings allowing air to slip past the piston inside the cylinder. Do the soapy water test on every fitting to locate hidden leaks. Ensure your compressor is actually rated to deliver the necessary output at 90 PSI. If your air consumption jumped suddenly in the middle of a job, stop operating the tool to prevent further internal damage.
Problem 6: Post Driver Works Slowly
Slow driving usually indicates that your air supply is dropping off mid-job, or the exhaust cannot clear fast enough. Watch the compressor gauge closely while you drive a post. If the needle keeps falling, you have found your problem.
Your air tank might be too small for steady continuous work, or the compressor recovery time is too slow. If upgrading the compressor is not an option, you will need to pause periodically to let the tank catch up. You should also check the small speed control orifice on the exhaust port to ensure it is not packed with dirt, which prevents the driver from cycling quickly. For more detailed advice, read our air compressor requirements for pneumatic post drivers guide.
Problem 7: Driver Is Damaging the Post
When posts end up bent, flared, or mushroomed at the top, the issue is almost always a sloppy fit. You must match the driver to the post size first, and then use the correct adapter sleeve to keep the impact dead-centered.
If you are running the standard lightweight 98-E T-Post Driver, it is already optimized for standard agricultural T-posts. However, if you are driving round galvanized pipe, you need to match your post diameter to the correct commercial unit. The 91-R Post Driver handles up to 2-3/8" outer diameter pipe, the 93-R Post Driver handles up to 2-7/8", and the heavy-duty 95-R Post Driver accommodates up to 3-1/2".
Check that your posts are actually thick-walled and designed to be driven. If a post goes in crooked or gets bent, do not leave it. Pull it cleanly with a heavy-duty T-post puller and reset it. For help sizing your equipment correctly, review our comprehensive post driver size guide.
Problem 8: Driver Is Hard to Control
A post driver that bucks or wanders usually suffers from too much play between the sleeve and the post, or it was started at an awkward angle. Expect the tool to move fast. On every single stroke, the handle and body will lift roughly 7 inches before driving down.
Use the correct adapter so the post fits snugly in the sleeve. Slide the post all the way up into the driver barrel before you snug the clamp handle. Stand the driver straight up, establish a firm footing, and keep a relaxed hand on the driver handle so you do not fight the machine's natural rhythm. Start slowly, and stop to re-square the post immediately if it begins to lean.
Compressor Setup Issues
A pneumatic post driver can only perform as well as the air system standing behind it. Do not run the tool above your model's design range. Excessive pressure forces the O-rings to fail prematurely and voids your warranty.
98-E T-Post Driver: 70 to 75 PSI
91-R Post Driver: 80 to 90 PSI
93-R Post Driver: 90 to 100 PSI
95-R Post Driver: 90 to 110 PSI
Contractor Note: If you regularly work in tough soil and need more speed, consider adding the High-Pressure Upgrade Kit to your setup. This kit includes an in-line regulator and new air tube designed to let your driver run unregulated up to 130 PSI, increasing performance up to 130 strokes per minute.
Always use an air hose with at least a 3/8-inch inside diameter, and keep the hose as short as possible. Thin or overly long hoses choke the airflow before it reaches the tool.
Lubrication and Maintenance Tips
Short Answer: Regular oiling is the single most important maintenance step for a pneumatic post driver. Proper oiling cuts friction, protects the O-rings, and keeps the internal piston cycling smoothly.
We highly recommend using Rohrer Lube Oil or a quality air tool oil. Per the Man Saver manual, you can also use 20-weight hydraulic oil or standard 5W-30 motor oil.
The easiest way to maintain your tool is to install an inline oiler in your air setup. It automatically feeds a fine mist of oil into the air stream as you work. If you do not have an oiler, pour 3 to 4 tablespoons of oil directly into the air hose at the compressor end before you start your shift. Never run the driver dry, and always store the tool in a clean, dry place with the air inlet covered.
When to Replace Parts
If you have checked the air supply, oiled the tool thoroughly, and it still lacks power, an internal wear part has likely reached the end of its lifespan. Look for persistent air leaks, weak performance even with high CFM, or O-rings that appear flattened and dried out.
Replace worn parts immediately before they cause larger mechanical failures. You can find the right part number on the parts diagram for your model. We stock a full inventory of post driver parts and post driver accessories to ensure your tool stays out in the field.
When to Contact Support
If basic troubleshooting does not fix the problem, call us before you continue to run the tool. Operating a damaged pneumatic post driver will only compound the damage.
Contact our technical support team if air leaks continue after replacing the seals, if internal parts look physically damaged, or if the driver completely refuses to cycle under proper pressure. All Man Saver post drivers are protected by a 90-Day Limited Warranty against manufacturing defects. Note that operator errors, such as dry-firing or exceeding recommended air pressure limits, are not covered under warranty, so proper daily maintenance is key.
If you have questions, reach out through our contact form or call technical support directly. When you call, you speak directly to the people who build and service these tools in Oregon.
Final Troubleshooting Summary
Most pneumatic post driver problems are caused by restricted air supply, lack of lubrication, loose fittings, or the wrong adapter setup. Start by checking your compressor output, hose diameter, oiling routine, and adapter fit before you assume the driver needs a major mechanical repair.
With the right setup and consistent care, a pneumatic fence post driver will remain one of the most dependable fence installation tools in your truck.
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Pneumatic Post Driver Troubleshooting FAQs
How do you troubleshoot a pneumatic post driver?
Start with the air supply. Check your compressor pressure, CFM output, air hose diameter, and fittings. Oil the tool, check the O-rings, clean the exhaust orifice, and tighten the clamp. Finally, confirm you are using the correct adapter for the post.
Why is my pneumatic post driver weak?
A weak driver is usually short on air or short on oil. The compressor may not supply enough CFM, the pressure regulator may be set too low, the hose may be too restrictive, or there may be an air leak. If the driver runs rapidly but the post does not move, securely tighten the clamp handle.
Why won't my pneumatic post driver fire?
Usually, no air is reaching the tool, or the valve is stuck dry. Check that the compressor is at full pressure and the coupler is fully seated. If the tool is dry, oil the center hole on the valve body and work the control lever up and down manually. If it stalled on solid rock, move the post slightly and try again.
Why is air leaking from my post driver?
Most leaks are caused by loose brass fittings, damaged quick-connect couplers, worn O-rings, or dirt keeping the internal parts from sealing perfectly.
How often should I oil a pneumatic post driver?
You must oil the driver every single day you use it. Run an inline oiler during use for the best results. Without an oiler, add 3 to 4 tablespoons of oil into the air hose at the compressor end before you start working.
What kind of oil should I use in a pneumatic post driver?
For Man Saver drivers, we highly recommend Rohrer Lube Oil or a quality air tool oil. Per the owner's manual, you may also use 20-weight hydraulic oil or 5W-30 motor oil.
Why does my post driver keep sticking?
A driver usually sticks because it is dry, dirty, wet inside from line condensation, or running in freezing weather. Worn O-rings, a worn valve spool, or a clogged speed control orifice can also restrict movement.
What air compressor do I need for a pneumatic post driver?
Man Saver drivers need a minimum of 2.5 CFM, and the heavy-duty 95-R requires 3.5 CFM. Choose a compressor that provides about 50% more than that rating so it does not run continuously. A 5.5 HP portable gas compressor usually does the job well.
Can the wrong air compressor damage a pneumatic post driver?
A compressor that is too small will leave the driver weak and slow. However, running an oversized compressor above the tool's design pressure can blow out O-rings and void the warranty. Additionally, wet air from an undrained tank washes out protective oil and speeds up internal rust.
What PSI does a pneumatic post driver need?
It depends on the specific model. Man Saver drivers range from 70 to 75 PSI for the 98-E, up to 90 to 110 PSI for the commercial 95-R. Unless you have installed the High-Pressure Upgrade Kit, you must stay within these factory limits.
Why is my pneumatic post driver damaging posts?
The usual causes are using the wrong adapter sleeve, running a driver that is too big for the post, driving a thin-walled post, a crooked start, or continuously hammering after the post hits impenetrable rock.
When should I replace O-rings or seals?
Replace them when air leaks keep coming back, when the driver stays weak or sticky after a full cleaning and oiling, or when the rubber looks visibly cracked, flat, or dried out.