Toro Groundsmaster 4500-D Series Service Manual page 200

Removal (Figure 96) (continued)
Installation (Figure
Hydraulic System: Service and Repairs
5. Read the General Precautions for Removing and Installing Hydraulic System
Components (page
6. For assembly purposes, label all hydraulic lines connected to gear pump
fittings.
7. Disconnect hydraulic lines from gear pump and put caps or plugs on open
hydraulic lines and fittings.
8. Support gear pump assembly to prevent it from falling.
9. Remove two (2) cap screws and washers that secure gear pump to piston
pump. Slide gear pump away from piston pump until gear pump shaft is
removed from piston pump coupler. Lower gear pump and remove from
machine.
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.
10. Remove O-ring (item 15) from gear pump flange. Discard O-ring.
11. If hydraulic fittings are to be removed from gear pump, mark fitting orientation
to allow correct assembly. Remove fittings from pump and discard O-rings.
96)
1. If fittings were removed from gear 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
2. Make sure mounting and O-ring sealing surfaces on the gear pump and
piston pump are clean.
3. Lubricate new O-ring (item 15) with clean hydraulic oil. Position O-ring on
gear pump flange.
g308680
1. Piston pump case drain
4. Align gear teeth on gear pump input shaft with piston pump shaft. Slide gear
pump input shaft into piston pump shaft. Secure gear pump to piston pump
with two (2) cap screws and flat washers.
5–87).
(Figure
Figure 97
2. Gear pump suction port
Page 5–98
97). When the gear pump is
Installing
5–9)).
Groundsmaster ® 4500-D/4700-D
19245SL Rev A