Toro Groundsmaster 4500-D Series Service Manual page 207

Removal (Figure 101) (continued)
Installation (Figure
Groundsmaster ® 4500-D/4700-D
19245SL Rev A
Note: A case drain exists in the piston (traction) pump and a suction port is
near the input shaft of the gear pump
removed from the piston pump, plug piston pump case drain hole to prevent
draining the piston pump.
Dry weight of piston (traction) pump is 41 kg (90 lbs).
8. Support the piston pump to prevent it from falling while removing two (2)
cap screws and washers retaining pump assembly to engine flywheel plate.
Carefully pull pump assembly from flywheel plate and lower it out of the
machine.
9. If hydraulic fittings are to be removed from piston pump, mark fitting
orientation to allow correct assembly. Remove fittings from pump and discard
O- rings.
101)
1. If fittings were removed from piston pump, lubricate and place new O- rings
onto fittings. Install fittings into pump ports using marks made during the
removal process to properly orientate fittings. Tighten fittings (see
the Hydraulic Fittings (SAE Straight Thread O-Ring Fittings) (page
To prevent spring coupler damage, make sure that piston pump is
properly supported and does not put side load into coupler during
pump installation.
2. Carefully raise piston pump into the machine, align pump input shaft to spring
coupler on engine and position it to the engine flywheel plate. Support pump
to prevent it from producing any side load into coupler and also to align pilot
diameter of pump to flywheel plate bore.
3. While maintaining pump alignment with spring coupler and flywheel plate,
install two (2) cap screws and washers to secure piston pump to engine.
A case drain exists in the piston (traction) pump and a suction port
is near the input shaft of the gear pump
pump is installed to the piston pump, make sure that plugs placed in
both of these ports are removed. Failure to remove plugs will cause
excessive pressure in the piston pump and damage seals. Also,
before securing gear pump to piston pump, fill piston pump housing
with clean hydraulic oil through case drain hole.
4. Remove plugs that were placed in piston pump case drain and gear pump
suction port. Fill piston pump housing with new hydraulic oil through case
drain hole.
5. Install gear pump to piston pump (see
(Figure
IMPORTANT
IMPORTANT
IMPORTANT
Gear Pump (page
Page 5–105
103). When the gear pump is
(Figure 103). Before the gear
5–97)).
Hydraulic System: Service and Repairs
Installing
5–9)).