Toro 30821 Service Manual page 142

WARNING
Before disconnecting or performing any work
on the hydraulic system, all pressure in the
system must be relieved. See Relieving Hy-
draulic System Pressure in the General Infor-
mation section.
4. Disconnect all hydraulic hoses connected to the hy-
draulic fittings on the piston and gear pumps. Allow
hoses to drain into a suitable container and plug hose
openings to prevent contamination.
CAUTION
Support piston and gear pumps when removing
them from the pump support and pump mount
plate to prevent them from falling and causing
personal injury.
5. Remove fasteners and spacers securing the pump
mount plate to the engine and pump support. Note loca-
tion of cap screws, washers, nuts and spacers for as-
sembly purposes. Pull pump mount plate with pumps,
pump pulley, and idler assembly from the machine.
6. Remove both cap screws and flat washers securing
gear pump to the piston pump. Separate gear pump and
O- ring from the piston pump. Plug openings of gear
pump to prevent contamination.
7. If hydraulic fittings are to be removed from piston
pump, mark fitting orientation to allow correct assembly.
Remove hydraulic fittings and O- rings from the piston
pump as needed.
8. Remove pulley from the taper lock bushing:
A. Remove cap screws securing pulley to the taper
lock bushing.
IMPORTANT: Excessive or unequal pressure on the
cap screws can break the bushing flange.
B. Insert cap screws into threaded removal holes of
the pulley. Tighten screws progressively and evenly
until the pulley is loose on the bushing. Remove
pulley from the bushing.
9. Loosen set screw that secures bushing to piston
pump. Remove bushing from the pump shaft.
10.Remove both lock nuts, flat washers, and cap
screws that secure the piston pump to the pump mount
plate. Remove pump from plate.
Hydraulic System (Rev. G)
11. If hydraulic fittings are to be removed from pump,
mark fitting orientation to allow correct assembly.
Piston Pump Installation (Fig. 104 & 105)
1. If hydraulic fittings were removed from piston pump,
install fittings to pump using marks made during the re-
moval process to properly orientate fittings.
2. Position and secure piston pump to the pump mount
plate with both flat washers, cap screws, and lock nuts.
3. Place key into pump shaft slot. Slide taper lock bush-
ing onto the piston pump shaft with bushing flange to-
ward pump housing.
4. Make sure that tapered surfaces of pulley and taper
lock bushing are thoroughly clean (no oil, grease, dirt,
rust, etc.).
5. Position pulley to taper lock bushing and align non-
threaded holes of pulley with threaded holes of bushing.
Loosely install three (3) cap screws with lock washers to
bushing and pulley.
6. Install O- rings and hydraulic fittings to their original
positions on the piston pump.
Note: If installing a new gear pump to the piston pump,
make sure to remove the plug from the suction port of
the gear pump (Fig. 106). The gear pump suction fitting
must be on the same side as the trunnion of the piston
pump.
7. Remove plugs from the gear pump. Secure O- ring
and gear pump to the piston pump with both flat washers
and cap screws. Torque fasteners from 27 to 31 ft- lb (37
to 42 N- m).
1
1. Gear pump
Page 4 - 102
2
Figure 106
2. Suction port
Groundsmaster 3500- D