Service manual

Groundsmaster 3280--D/3320 Hydraulic SystemPage 5 -- 39
Hydrostatic Transmission Neutral Arm Assembly
1. Transmission housing
2. Cap screw
3. Mounting plate
4. Neutral return spring
5. Neutral return arm
6. Bushing
7. Grease fitting
8. Eccentric pin
9. Retaining ring
10. Jam nut
11. Socket head screw
12. Pin
13. Bearing
14. Socket head screw (4 used)
15. Socket head screw
16. Neutral proximity switch
17. Trunnion cam
18. Seal
Figure 30
1
2
3
4
5
6
8
9
10
17
11
12
13
14
15
7
18
16
9
71 to 89 in--lb
(8 to 10 N--m)
28 to 36 in--lb
(3.3 to 4.1 N--m)
15 to 17 ft--lb
(20to24N--m)
(8 to 10 N--m)
71 to 89 in--lb
Disassembly (Fig. 30)
1. Disassemble neutral arm components on hydrostat-
ic transmission as needed using Figure 30 as a guide.
NOTE: To remove trunnion cam (item 17) from hydro-
static transmission, transmission has to be disas-
sembled.
Assembly (Fig. 30)
1. Assemble neutral arm components to hydrostatic
transmission using Figure 30 as a guide. If eccentric pin
(item 8) was removed, make sure that mark on eccentric
pin is orientated to top of transmission. Note fastener
torque specifications shown in Figure 30.
2. Lubricate grease fitting on eccentric pin (see Trac-
tion Unit Operator’s Manual).
3. Check and adjust neutral position (see Traction Unit
Operator’s Manual).
4. Check for correct operation of neutral switch and ad-
just if needed (see Traction Neutral Switch adjustment
in the Components section of Chapter 6 -- Electrical Sys-
tem).
1. Eccentric pin 2. Alignment mark
Figure 31
2
1
Hydraulic
System