d.
After adjustment, hold the screw in place and torque the locknut to 12-16 ft. lbs.
4-6.4 Hydraulic Gear Pump. (Figure 4-16)
4-6.4.1 Disassembly. Thoroughly clean the exterior of the pump prior to disassembly.
a.
Clamp the pump body (1) securely in a soft jawed vise. Cover sharp edges of drive shaft with tape.
b.
Remove nuts (12), lockwasher (11), and screws (8 and 10).
CAUTION
Do not use a screwdriver to attempt to pry flange (2) or end cover (3) from body (1).
c.
Carefully remove the flange (2) and end cover (3) from the pump body (1). Should these be tight on their
dowels, lightly tap with a mallet to release. Remove seals (15), loading rings (16) and backing ring (7).
d.
Withdraw the gears (4 and 5) and bearings (6) from the body (1) as an assembly and carefully note their original
positions.
NOTE
It is suggested the top bearing be lightly marked on an unmachined surface to aid proper
assembly.
e.
Remove retaining ring (13),then, supporting the flange outer face downward, tap out the oil seal (17) with a soft
metal drift.
Figure 4-16. Hydraulic Gear Pump
4-68
