Gear Pump - Toro Reelmaster 3550-D Service Manual

Gear Pump

RIGHT
FRONT
1. Piston pump
2. Gear pump
3. Hydraulic hose (tank suction)
4. Hydraulic hose (hydraulic manifold)
5. Hydraulic hose (steering valve)
6. Hose clamp
Removal (Fig. 53)
1. Park machine on a level surface. Lower cutting units,
stop engine and engage parking brake. Remove key
from the ignition switch. Raise and support hood.
2. Remove muffler from the engine to gain access to
the gear pump (see Exhaust System in Chapter 3 − Ku-
bota Diesel Engine in this manual).
WARNING
Before disconnecting or performing any work on
the hydraulic system, all pressure in the system
must be relieved. See Relieving Hydraulic Sys-
tem Pressure in this chapter.
3. Thoroughly clean hydraulic hose ends and fittings on
gear pump to prevent hydraulic system contamination.
4. Drain hydraulic oil from hydraulic tank by disconnect-
ing the suction hose from the barbed fitting in the bottom
of the gear pump. Drain tank into a suitable container.
Reelmaster 3550−D/3555−D/3575−D
4
12
1
3 6
Figure 53
7. Hydraulic barb fitting
8. O–ring
9. O–ring
o
10. 90 hydraulic fitting
11. O–ring
12. O–ring
5. Label hydraulic hoses and fittings on gear pump for
assembly purposes.
6. Disconnect hydraulic hoses connected to the hy-
draulic fittings on the gear pump. Allow hoses to drain
into a suitable container. Plug hose openings to prevent
contamination.
NOTE: A case drain exists in the piston pump/hydrostat
and a suction port is near the input shaft of the gear
pump (Fig. 54). When the gear pump is removed from
the piston pump, plug piston pump case drain hole to
prevent draining the piston pump.
7. Remove both cap screws and flat washers securing
gear pump to the piston pump. Separate gear pump
from the piston pump. Locate and retrieve O−ring. Plug
openings of gear pump to prevent contamination.
8. If hydraulic fittings are to be removed from gear
pump, mark fitting orientation to allow correct assembly.
Remove hydraulic fittings and O−rings from the gear
pump as needed. Discard removed O−rings.
Page 4 − 87
9
5
10
11
13
14
2
15
16
17
8
7
o
13. 90 hydraulic fitting
14. O–ring
15. Cap screw
16. Flat washer
17. O–ring
Hydraulic System