plate (28) fits into the gear housing. Use a soft
3. Stone the faces of the gear housing (26) to
hammer to seat or position the port end cover
remove any burrs that might have occurred in
assembly against the housing, making sure the
handling. Clean all surfaces (air blast or wipe).
"O" ring (27) on the face of the housing is not
Install pre-greased "O" rings (24, 27) in the
grooves in the faces of the housing (26).
6. Thread the four cap screws (39) into the shaft
Tighten the four cap screws
alternately to 100 ft. lbs. of torque.
7. Rotate the shaft with a six inch wrench. Protect
the shaft splines when using a wrench. The
shaft should rotate easily.
8. Thread the grease fitting (12) into the shaft end
cover (9)-IF-it was removed. Fill the cavity with
a #2 consistency, lithium base, high
temperature, ball bearing grease until a grease
film appears around the shaft (6). The pump is
now ready for installation and run-in.
Installing pre-greased "O" ring
4. Place the gear housing (26) over the drive gear
(23) and tap into position with a soft hammer
(plastic or leatherhead). Be careful not to pinch
the "O" ring (24) when positioning the housing.
Install the driven gear (32) into its respective
bore. Pour a small amount of oil over the gears
to provide initial lubrication when putting the
pump back into service.
5. Install the port end cover subassembly on the
gear housing (26). Hubs of gears fit into the I.D.
of the roller bearings (37, 40) and thrust
Installing port end cover
IMPORTANT PRECAUTION TO OBSERVE BEFORE
OPERATING NEW OR REBUILT HYDRAULIC PUMPS
To avoid possible damage to a new or rebuilt hydraulic
pump or motor, back off the main relief valve adjusting
screw (or remove adjusting shims or spacers) before
operating unit. Then, AFTER UNIT HAS RUN-IN FOR
ABOUT 5 MINUTES AT ZERO PRESSURE (with all
control levers in neutral position) adjust relief valve
pressure to proper and prescribed setting. Failure to
observe this precaution can result in almost immediate
failure of the hydraulic unit-if the relief valve pressure
setting should be excessive.
Installing gear housing