Toro Greensmaster TriFlex 3320/3420 Service Manual page 107

4. Loosen the four (4) cap screws that secure pump as-
sembly.
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
section. Be careful to not drop parts or disengage gear
mesh.
IMPORTANT: Mark the relative positions of the gear
teeth and the thrust plates so they can be as-
sembled 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 pump. Be-
fore removing 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.
8. Turn front cover over, with seal side up.
IMPORTANT: Make sure to not damage the front
cover counter bore when removing the seal from the
cover.
9. Carefully remove retaining ring and shaft seal from
the front cover (Fig. 37). Discard removed seal.
10.Clean all parts. Check all components for burrs,
scoring, nicks or other damage.
11. Replace the entire pump assembly if any internal
pump components are excessively worn, scored or
damaged.
Gear Pump Assembly (Fig. 35)
NOTE: When assembling the gear pump, check the
marker line on front cover, housing and end cover to
make sure the parts are properly aligned during as-
sembly.
1. Apply clean hydraulic oil to all pump parts before as-
sembling.
2. Install new seal into front cover (Fig. 37):
A. Press shaft seal into front cover until it reaches
the bottom of the bore. Shaft seal should have the
seal lip and spring toward the inside of the pump.
B. Install retaining ring into the groove of the front
cover. Make sure that retaining ring is fully seated in
front cover groove.
Greensmaster 3320/3420
NOTE: Pressure and back--up seals fit in grooves ma-
chined into thrust plates. Body O--rings fit in grooves ma-
chined in housing.
3. Assemble pump components starting at front cover
end. Apply grease or petroleum jelly to new section
seals to hold them in position during gear pump assem-
bly.
4. After pump has been assembled, tighten four (4) cap
screws by hand. Rotate the drive shaft to check for bind-
ing. Protect the shaft if using a pliers to rotate shaft.
5. Torque the cap screws evenly in a crossing pattern
to 33 ft- -lb (45 N- -m).
1
1. Drive shaft
2. Retaining ring
Page 5 - - 53
3
2
Figure 37
3. Shaft seal
Hydraulic System