Toro Groundsmaster 5900 Series Service Manual page 190

Gear Pump Disassembly
Gear Pump Inspection
Hydraulic System: Service and Repairs
(Figure 82) (continued)
8. Remove the thrust plates and seals from each pump section. Before
removing each gear set, apply marking dye to mating teeth to retain "timing".
Pump efficiency may be affected if the teeth are not installed in the same
position during assembly. Keep the parts for each pump section together;
do not mix parts between sections.
1. Remove any nicks and burrs from all parts with emery cloth.
Use eye protection such as goggles when using compressed air.
2. Clean all parts with solvent. Dry all parts with compressed air.
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1. Gear shaft spline
2. Gear shaft
3. Inspect drive gears and idler gears for the following
A. Gear shafts should be free of rough surfaces and excessive wear at
bushing points and sealing areas. Scoring, rough surfaces or wear on
gear shafts indicates need for replacement.
B. Gear teeth should be free of excessive scoring and wear. Any broken or
nicked gear teeth must be replaced.
C. Inspect gear face edge for sharpness. Sharp edges of gears will mill into
thrust plates and, thus, must be replaced.
4. Inspect thrust plates for the following:
A. Bearing areas should not have excessive wear or scoring.
B. Face of thrust plates that are in contact with gears should be free of wear,
roughness or scoring.
C. Thickness of thrust plates should be equal.
5. Inspect front flange and rear cover for damage or wear.
6. If internal parts are found to be worn or damaged, gear pump replacement
is necessary.
CAUTION
2
2
1
4
3
2
Figure 84
3. Gear teeth
4. Gear face edge
Page 5–90
2
(Figure 84):
Groundsmaster ® 5900 & 5910
16227SL Rev B