Toro Groundsmaster 5900 Series Service Manual page 223

Cutting Deck Motor Assembly
Groundsmaster ® 5900 & 5910
16227SL Rev B
(Figure 106)
Note: When assembling the motor, check the marker line on each part to make
sure the parts are properly aligned during assembly.
1. Lubricate O–rings, pressure seals, back−up gaskets and thrust plate grooves
with a thin coat of petroleum jelly. Lubricate all other internal parts freely with
clean hydraulic fluid.
2. Install new seals into front flange
A. Press inner shaft seal into front flange until it reaches the bottom of the
bore.
B. Install flange washer into front flange and then install retaining ring into
the groove of the front flange.
C. Install outer shaft seal into front flange.
3. Place front flange, seal side down, on a flat surface.
4. Install the pressure seals, flat side outward, into the grooves in the thrust
plates. Follow by carefully placing the backup gaskets, flat side outward,
between the pressure seals and the grooves in the thrust plate.
5. Apply a light coating of petroleum jelly to the exposed side of the front flange.
6. Lubricate the drive gear shaft with clean hydraulic fluid. 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 motor.
Carefully install shaft into front flange. Be careful not to nick seals with shaft
threads.
7. Lubricate the idler gear shaft with clean hydraulic fluid. Install idler gear shaft
into the remaining position in the front thrust plate. Apply a light coating of
clean hydraulic fluid to gear faces.
8. Install rear thrust plate with pressure seal side up and open side of the
pressure seal pointing to the inlet side of the motor.
9. Apply a light coating of petroleum jelly to new O–rings and O–ring grooves in
the body. Install new O–rings to the body.
10. Install locating dowels in body. Align marker line on the body and front flange.
Do not dislodge seals during installation.
11. Gently slide the body onto the assembly. Firm hand pressure should be
sufficient to engage the dowels.
12. Check to make sure that the surface of the rear thrust plate is slightly
below the face of the body. If the thrust plate is not below the body, check
assembly for a shifted pressure seal, backup gasket or O–ring. Correct
before proceeding.
13. Apply a light coating of petroleum jelly to the exposed side of the rear cover.
14. Place rear cover on assembly using marker line for proper location. Firm
hand pressure should be sufficient to engage the dowel pins.
15. Install the four (4) cap screws with washers and hand tighten screws.
Prevent damage when clamping the motor into a vise; clamp on the
front flange only. Also, use a vise with soft jaws.
(Figure 108):
IMPORTANT
IMPORTANT
Page 5–123 Hydraulic System: Service and Repairs