Foot-actuated air over hydraulic pump that drives a shop press or single-acting ram to 10,000 PSI so both hands stay on the part.
If you rebuild transmissions on a bench, most of the press work happens with both hands busy: one squaring a bushing driver in a pump body, the other holding the case or drum steady. A hand-lever pump takes one of those hands away. This E5102C air over hydraulic foot pump runs off the shop compressor, feeds a single-acting press cylinder up to 10,000 PSI, and is worked with your foot, so the part stays square while it moves.
The pump turns 90-120 PSI shop air into hydraulic pressure. Compressed air drives a small piston inside the aviation-aluminum body, which pushes oil from the 1.6 liter (98 cubic inch) reservoir out of the 3/8 in NPT outlet to your ram. The pedal label lists three positions: advance, hold and retract. Advance builds pressure, hold keeps the ram where it is while you check alignment, and the release lets the ram come back on its own return spring. The release is two-stage, so you can drop pressure all at once when a stuck bearing lets go, or bleed it off slowly while easing a bushing into a soft aluminum bore. An internal relief valve caps output so the cylinder is not overpressured.
Typical jobs it handles at that bench:
This pump drives a separate, single-acting cylinder through a hose. It does not attach to a bottle jack that has its own built-in pump handle, and it will not power a double-acting ram, which needs pressure on both sides to return. Check that your press cylinder has a hose port and returns on a spring, and that the port matches 3/8 in NPT or that you have an adapter. If you are still choosing a press, a 12-ton H-frame shop press is the size range most transmission benches use. Before pressing anything, our guide to converter hub and pump bushing wear explains how to tell whether a pump bushing actually needs replacing.
It is a general shop tool, not tied to one transmission, so it serves GM, Ford, Chrysler and import benches alike. For the rest of the bench, see our transmission tools and the checklist in bench rebuild tools needed.
| Max pressure | |
| Reservoir | |
| Oil outlet | |
| Air inlet | |
| Pump body | |
| Release | |
| Cylinder type | |
| Weight | |
| Part number |
Only if the press uses a separate single-acting cylinder with a hose port. A bottle jack with its own built-in pump handle has no inlet for an external pump. Presses sold with an air or remote pump option, or a ram with a 3/8 in NPT port, are the right match.
Supply it with 90-120 PSI shop air through the 1/4 in NPT inlet. A small home compressor will run it, but recovery is slower on long press jobs.
No. It has a single outlet and is built for single-acting rams that return on a spring or by gravity. A double-acting ram needs a pump with a return circuit.
It ships pre-filled. When topping up, use hydraulic jack oil and check the level with the ram fully retracted so the reservoir is not overfilled.
The 10,000 PSI figure is the ceiling, not the working pressure. Bushings and bearings usually move well below it, and the pedal lets you build pressure gradually and stop the instant the part moves, which is safer for aluminum pump bodies than a fast hand pump.
