TM 5-3810-300-24 & P2
POWER STEERING SYSTEM.
Hydraulic Pump.
REMOVAL. (Illus. 4-51).
Removal of the pump is obvious. Therefore no removal procedures are given.
DISASSEMBLY. (Illus. 4-52).
1.
Clean unit thoroughly with solvent, kerosene, or other non-corrosive cleaning fluid, which will not affect rubber
components.
2.
Scribe a line across the three sections of the pump to act as a guide in reassembly.
3.
Remove the six hex screws (3), and two cap screws (2). Remove the key (23) from the drive shaft. (Four hex screws
in "D" series).
4.
Remove the front cover (5) by lightly tapping the flange with a soft metal hammer.
5.
The center section (12) will remain attached to either the front cover (5) or back cover (21). Place the drive gear (13)
into the unseparated sections, and while holding the center section (12), tap lightly to separate. Be careful to avoid
cocking on the dowel pins (7).
6.
Remove wear plate (10) and thrust plate (22).
7.
Mark the front cover island next to the pressure vent hole in the heat shield (9), gasket (8), and V-seal (6) to act as a
guide in reassembly. The location of this vent hole determines pump rotation.
8.
Use a small diameter wire (a paper clip will do) to remove the phenolic heat shield (9), the paper compound gasket
(8) and the rubber "V" seal (6). Discard these parts and replace when pump is reassembled.
9.
Remove both "O" rings (11) and discard. They also should be replaced.
10.
Do not remove shaft seal (1) in the front cover (5) unless it is damaged or leaking. If seal is to be replaced, use great
care not to damage the seal recess or bearing. Heating cover in an oven to 250OF will reduce the press fit.
11.
If flow control is defective replace as a cartridge.
12.
If R/V is defective replace as complete R/V unit.
INSPECTION.
Drive and Driven Gear Assemblies.
Inspect shafts for roughness in the bearing and sealing areas. Measure for wear. Minimum acceptable .4998" in "D",
.7492" in "H" and .9365" in "M". 5J surface finish maximum.
Inspect keyway, keys or splines for damage or excessive wear.
Inspect the gear end faces, outside diameter and teeth for roughness and score marks. The O.D. of the "D" gears must be
1.7140" minimum and the "M" gears 2.1047" minimum. For minimum gear widths see table
4-327
