Toro Groundsmaster 4300-D Service Manual page 170

Disassembling the Gear Pump
Hydraulic System: Service and Repairs
Note: The gear pump must be replaced as a complete assembly. Individual
gears, housings, and thrust plates are not available separately. Disassemble the
gear pump for cleaning, inspection, and seal replacement only.
Keep bodies, gears, flanges, and thrust plates for each pump section
together; do not mix the parts between the pump sections.
1. Plug the pump ports and clean the outer surface of the pump with cleaning
solvent. Ensure that the work area is clean.
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2. Use a marker to make a diagonal line across the gear pump for assembly
purposes (Figure 90).
Use caution when clamping the gear pump in a vise to avoid
distorting any pump components.
3. Secure the front cover of the pump in a vise with the driveshaft pointing down.
4. Loosen the 2 bolts (item 21 in
assembly.
5. Remove the pump from the vise and remove the fasteners.
6. Support the pump assembly and gently tap the pump case with a soft-faced
hammer to loosen the pump sections. Do not drop the parts or disengage
the gear mesh.
Mark the relative positions of the gear teeth and thrust plates so that
you can be assemble them in the same position. Do not touch the
gear surfaces as residue on hands may be corrosive to gear finish.
7. Remove the thrust plates and seals from each pump section. Before
removing each gear set, apply marking dye to the mating teeth to retain
IMPORTANT
Figure 90
IMPORTANT
Figure 89) and 2 nuts that secures the pump
IMPORTANT
Page 4–108 Groundsmaster ® 4300-D
16226SL Rev C