Toro Groundsmaster 5900 Series Service Manual page 191

Gear Pump Assembly
Groundsmaster ® 5900 & 5910
16227SL Rev B
(Figure 82)
Note: When assembling the pump, check the marker line on each part to make
sure the parts are properly aligned during assembly.
1. Lubricate body seals, pressure seals, uni−rings and thrust plate grooves
with a thin coat of petroleum jelly. Lubricate all other internal parts freely
with clean hydraulic oil.
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1. Drive shaft
2. Shaft seal
2. Note seal orientation and install new seals into front cover
A. Press first shaft seal into front cover until it reaches the bottom of the bore.
B. Install second shaft seal into front flange.
C. Install retaining ring in front cover.
3. Place front flange, seal side down, on a flat surface.
4. Assembly pump section P1:
A. Install the pressure seals, flat side outward, into the grooves in the
thrust plates. Follow by carefully placing the uni−rings, flat side outward,
between the pressure seals and the grooves in the thrust plate.
B. Apply a light coating of petroleum jelly to the exposed side of the front
flange.
C. Lubricate the drive shaft/gear with clean hydraulic oil. Insert the drive end
of the drive shaft through the thrust plate with the pressure seal side
down and the open side of the pressure seal pointing to the inlet side of
the pump. Install shaft into front cover.
D. Lubricate the idler shaft/gear with clean hydraulic oil. Align the position
markings made during disassembly and install idler gear shaft into the
front thrust plate and front cover. Apply a light coating of clean hydraulic
oil to gear faces.
E. Install rear thrust plate with pressure seal side up and open side of the
pressure seal pointing to the inlet side of the pump.
F. Install steel bushings/dowel pins in body.
G. Apply a light coating of petroleum jelly to new body seal and body seal
groove in the body. Install new body seal into the body.
1
4 3
Figure 85
3. Dust seal
4. Retaining ring
Page 5–91
2
(Figure 85):
Hydraulic System: Service and Repairs