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6. Position the press ring over the seal. Make sure
the seal stays centered and true with the bore, and
start applying pressure with the vise. Continue
pressing the seal until it just clears the snap ring
groove in the bore.
7. Install snap ring (2, Figure 3-11) with the snap ring
opening over the weep hole (10).
8. Install the Outboard seal (metal face out), until it
just contacts the snap ring.
9. Lubricate the thru stud threads (14, Figure 3-11)
with hydraulic oil. Thread the studs into flange
until snug. There are 4 long studs and 4 short
studs. Reference Figure 3-12 for proper stud loca-
tion. Lubricate and install O-ring (7). Install dowel
pins (12), if removed. Install gear plate (13). Make
sure the recess in the gear plate will be toward the
connector plate, or facing up when the gear plate
is installed.
10. Install steel rings (5, Figure 3-12). Lubricate and
install backup ring (8), O-ring (7) and ring retainer
(6) as shown in Figure 3-12.
11. Install the isolation plate (9) on the suction side of
the gear plate. The isolation plate has a relief area
FIGURE 3-11. SHAFT SEAL INSTALLATION
1. Outboard Shaft Seal
2. Snap Ring
3. Inboard Shaft Seal
4. Seal, Metal Face
5. Flange
6. Steel Ball
7. O-ring
L03027
8. Bearing
9. Bearing
10. Weep Hole
11. Plug
12. Dowel
13. Gear Plate
14. Thru Studs
Hydraulic Component Repair
milled on one side; turn that side up or toward the
pressure plate.
12. With the bronze side up and the milled slot facing
toward the discharge side, slide pressure plate (2,
Figure 3-13) down into the gear bores until it rests
on the backup ring and O-ring. Do not force the
plate down the gear bores. If it hangs up on the
way down, work it back and forth until it slides
freely into place.
13. Coat the inside of the gear plate and the gears with
clean hydraulic oil.
NOTE: To ensure the gear pump is correctly timed
during reassembly, place a mark on the end of the
input shaft to indicate the location of the valley be-
tween any two gear teeth. Refer to Figure 3-16 which
illustrates gear timing.
14. With the extension end of the drive gear facing
toward the shaft seals, install the drive gear. Do not
drop the gear in the bore as damage to the bronze
face of the pressure plate could result. Use care
when pushing the drive gear extension thru the
shaft seals. Install the idler gear.
FIGURE 3-12. PUMP REASSEMBLY
1. Gear Plate
2. Drive Gear
3. Idler Gear
4. Bearing
5. Steel Ring
6. Retainer
7. O-ring
8. Backup Ring
9. Isolation Plate
10. Relief Area
11. Thru Studs
L3-9
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