Toro Groundsmaster 7210, Service Manual

Page: 171 / 342

Inspecting the Gear Pump
CAUTION
Use eye protection such as goggles when using compressed air.
1. Clean all the pump parts with solvent and dry them with compressed air.
2. Inspect the drive gear, idler gear, and bearing blocks for the following. If
damage is found, the pump replacement is necessary.
g033481
Figure 121
1. Gear shaft spline 3. Gear teeth
2. Gear shaft 4. Gear face edge
A. Gear shafts must be free from rough surfaces and excessive wear at
the bushing points and sealing areas. Replace the gears if you find any
scoring, rough surfaces, or wear on the gear shafts.
B. Gear teeth must be free from excessive scoring and wear. Replace the
gears if you find broken or nicked gear teeth.
C. Gear face edge must be free from sharpness. The sharp edges of gears
will mill into the bearing blocks. Replace the gears if you find any sharp
gear face edge.
D. Bearing areas of the bearing blocks must not have excessive wear or
scoring.
E. Face of the bearing blocks that are in contact with the gears must be
free of wear, roughness, or scoring.
3. Inspect the front plate and back plate for damage or wear. If the plates are
damaged or worn, replace the pump.
Assembling the Gear Pump
Note: When assembling the pump, check the V-shaped marker line made during
disassembly to ensure that the components are properly aligned.
1. Lubricate new O-rings, pressure seals, and back-up gaskets with a thin coat
of petroleum jelly, and lubricate all internal pump parts freely with clean
hydraulic fluid.
2. Install new shaft seal in the front plate.
Note: The seal should be pressed into place until it reaches the bottom
of the bore.
3. Install the retaining ring into the groove of the front plate.
Groundsmaster 7210 Page 4–111 Hydraulic System: Service and Repairs
16222SL Rev C