Toro Greensmaster 3120 Service Manual page 130

Disassembling the Gear Pump
Hydraulic System: Service and Repairs
Disassemble gear pump for cleaning, inspection and seal replacement only.
Individual gears, housings and thrust plates are not available separately. If
internal components are worn or damaged, the gear pump must be replaced as
a complete assembly.
1. Plug pump ports and thoroughly clean exterior of pump with cleaning solvent.
Make sure work area is clean.
g217546
1. "V" mark
2. Use a marker to make a "V" across the front cover, housing and end cover for
assembly purposes; refer to
Avoid distorting any pump components when clamping gear pump
in a vise. Use a vise with soft jaws.
3. Secure the front cover of the pump in a vise with the drive shaft pointing down.
4. Loosen the four (4) socket head screws that secure pump assembly.
5. Remove pump from vise and remove fasteners.
6. Support the pump assembly and gently tap the pump housing with a soft
face hammer to loosen the pump sections. Be careful to not drop parts or
disengage gear mesh.
Keep gears and thrust plates for each pump section together; do not
mix parts between pump sections. Mark the relative positions of
the gear teeth to the thrust plates so they can be assembled in the
same position. 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. Do
not touch the gear surfaces as residue on hands may be corrosive
to gear finish.
7. Remove the thrust plates, seals and gears from each pump section. Keep
the parts for each pump section together; do not mix parts between sections.
Figure 54
Figure 54.
IMPORTANT
IMPORTANT
Page 4–84 Greensmaster 3120
17230SL Rev C