Service Manual

Groundsmaster 4300--DHydraulic System Page 4 -- 74
Gear Pump Service
1. Front cover
2. Dowel pin (16 used)
3. Square section seal (8 used)
4. Back--up ring (8 used)
5. Pressure seal (8 used)
6. Thrust plate (8 used)
7. Drive shaft
8. Driven gear (2 used)
9. Body (P1 section)
10. Flange (3 used)
11. Splined connecting shaft (3 used)
12. Drive gear
13. Body (P2 section)
14. Drive gear
15. Driven gear
16. Body (P3 section)
17. Drive gear
18. Driven gear
19. Body (P4 section)
20. Rear cover
21. Washer (4 used)
22. Stud bolt (2 used)
23. Nut (2 used)
24. Cap screw (2 used)
Figure 72
4
1
2
9
10
11
8
5
6
7
12
3
6
8
13
14
17
18
15
16
19
20
21
22
23
24
21
33 ft--lb
(45 N--m)
33 ft--lb
(45 N--m)
Disassembly (Fig. 72)
NOTE: Thegear pumpmustbe replacedas a complete
assembly. Individual gears, housings and thrust plates
are not available separately. Disassemble gear pump
for cleaning, inspection and seal replacement only.
IMPORTANT: Keep bodies, gears, flanges and
thrustplatesforeachpump section together; do not
mix parts between pump sections.
1. Plug pump ports and thoroughly clean exterior of
pump with cleaning solvent. Make sure work area is
clean.
2. Use a marker to make a diagonal line across the
gear pump for assembly purposes (Fig. 73).
IMPORTANT: Use caution when clamping gear
pump in a vise to avoid distorting any pump compo-
nents.
3. Secure the front cover of the pump in a vise with the
drive shaft pointing down.
4. Loosen the two (2) cap screws and two (2) nuts that
secures pump assembly.
5. Remove pump from vise and remove fasteners.
6. Supportthepump assemblyandgentlytapthepump
case with a soft face hammer to loosen the pump sec-
tions. Be c areful to not drop parts or disengage gear
mesh.