Manually installing a long fence line can mean lifting a heavy post pounder hundreds—or thousands—of times. Tractor-mounted hydraulic drivers make the work easier, but they are expensive, bulky and unable to reach every corner of a farm or job site.
The Man Saver Post Driver offers a solution between those two extremes. Made by Rohrer Manufacturing in Oregon, it is a portable pneumatic tool that slips over a fence post and uses compressed air to deliver a rapid series of blows. One person can carry and operate it without needing a tractor, gasoline engine or battery.
The idea is not new. Founder Dan Rohrer developed the original Man Saver in 1997, and the company has since expanded it into a family of drivers for T-posts, round pipe, signposts, vineyard stakes and other applications.
How the pneumatic post driver works
The Man Saver connects to an external air compressor through a conventional pneumatic hose. Compressed air moves its internal hammer mechanism both upward and downward, repeatedly striking the top of the post and forcing it into the soil.
Depending on the model, the mechanism delivers between 50 and 85 strokes per minute. The operator positions the post, lowers the driver over it and controls the tool as the post moves into the ground.
Unlike a gasoline-powered post driver, the Man Saver has no onboard engine. That keeps the tool comparatively simple and eliminates batteries and electronic controls, although it means users must bring a suitable compressor and hose.
Four models cover different post sizes
Rohrer’s current range begins with the compact 98-E, a dedicated T-post driver weighing 26 lb (11.8 kg). It requires 2.5 CFM at 70 PSI and operates at 80 to 85 strokes per minute. Its standard capacity covers T-posts and 1.5-inch Timeless composite posts, while optional sleeves allow it to handle 7/8- and 1-1/4-inch round posts.
The larger models accept progressively wider round posts:
- 91-R: 34 lb (15.4 kg), posts up to 2-3/8 inches, 70–75 strokes per minute
- 93-R: 38 lb (17.2 kg), posts up to 2-7/8 inches, 60–70 strokes per minute
- 95-R: just under 48 lb (21.8 kg), posts up to 3-1/2 inches, 50–60 strokes per minute
The stated diameter is the driver’s maximum opening, not the only post size it can use. Interchangeable adapters allow the larger tools to fit T-posts, square or rectangular tubing, U-channel signposts, vineyard stakes and other profiles, provided they remain within the model’s capacity.
A small compressor provides the power
Rohrer says even its largest driver requires only around 3.5 CFM at 90 PSI, allowing the tools to operate from a relatively small portable compressor. The 91-R is specified at 3.5 CFM and 80 PSI, while the 93-R and 95-R require 3.5 CFM at 90 PSI.
Maximum pressure differs by model and should not be exceeded. Rohrer lists a 90-PSI maximum for the 91-R and 100 PSI for the 93-R. The 95-R page is inconsistent: its description mentions 110 PSI, while the technical specifications say 100 PSI. Following the lower figure—or confirming the correct setting with Rohrer—is the safer approach.
The compressor is not included in the base price. Users will also need a hose and should use a pressure regulator and inline oiler or regularly add pneumatic-tool oil.
Designed to go where hydraulic equipment cannot
Portability is arguably the Man Saver’s main attraction. A driver, hose and small compressor can be carried in a pickup or UTV, letting an operator reach vineyard rows, trails, embankments and cramped construction sites that may be unsuitable for a tractor or skid steer.
Rohrer markets the system for ranch and livestock fencing, chain-link installations, orchard and vineyard trellises, temporary construction fencing, concrete-form stakes, road signs and trail markers. Purdue University’s National AgrAbility Project also lists the pneumatic driver as an assistive tool for people affected by back, strength or endurance limitations.
That does not mean it removes every difficult part of the job. The operator still has to lift and stabilize a tool weighing up to 48 lb, manage the air hose and keep the post aligned. Soil conditions matter as well. Pneumatic hammering may help in clay and hardpan, but rocks or buried obstructions can stop a post, and Rohrer acknowledges that pilot holes may be required in extremely rocky terrain.
Maintenance and safety
Regular lubrication is the most important maintenance requirement. Rohrer recommends an inline oiler or frequent application of air-tool oil to protect the internal piston and seals. Replacement O-rings, springs and other components are available from the manufacturer.
Dry-firing, misfiring and excessive air pressure can damage the mechanism. Users should also wear suitable eye, hearing, hand and foot protection, keep others clear of the working area and contact the local utility-location service before driving posts where underground services could be present.
Pricing and availability
At the time of writing, the 98-E costs $795. The larger 91-R is $995, the 93-R is $1,129 and the 95-R is $1,249 through Rohrer Manufacturing.
Optional equipment includes a $69.95 starter kit, $34.95 pressure regulator, $29.95 inline oiler, $34.95 hose, adapters generally priced from $49 to $79 and a separate $89.95 T-post puller. A compressor must be purchased or supplied separately.
The Man Saver will not replace heavy hydraulic machinery on every fencing project, but it fills a useful gap. It provides powered post driving in a package one person can carry, while its pneumatic construction avoids the engine, fuel and electronics found in many other powered alternatives.
Source: Rohrer Manufacturing
