Service manual

Groundsmaster 3280--D/3320Hydraulic System Page 5 -- 52
Steering Cylinder Service (4 Wheel Drive)
1. Internal collar
2. Dust seal
3. Backup washer
4. O--ring
5. Head
6. Rod seal
7. Shaft
8. O--ring
9. Uni--ring
10. Piston
11. Lock nut
12. Barrel
Figure 40
2
7
3
4
5
1
10
12
11
9
6
8
Disassembly (Fig. 40)
1. Remove oil from cylinder into a drain pan by slowly
pumping the cylinder shaft. Plug both ports and clean
the outside of cylinder.
IMPORTANT: Prevent damage when clamping the
steering cylinder into a vise; clamp on the pivot end
only. Do not close vise enough to distort the barrel.
2. Mount steering cylinder in a vise so that the shaft end
tilts up slightly.
3. Remove internal collar (item 1) from the barrel.
4. Grasp clevis end of shaft (item 7); extract shaft, head
(item 5) and piston (item 10) by carefully twisting and
pulling the shaft from the barrel.
IMPORTANT: Do not clamp vise jaws against shaft
surface. Protect shaft surface before mounting in
the vise.
5. Mount shaft securely in a vise. Remove lock nut (item
11) and piston from the shaft. Slide head and internal
collar off the shaft.
6. Remove and discard uni--ring (item 9) and o--ring
(item 8) from the piston. Remove and discard dust seal
(item 2), backup washer (item 3), o--ring (item 4) and rod
seal (item 6) from the head.
Inspection
CAUTION
Use eye protection such as goggles when using
compressed air.
1. Wash all cylinder components in solvent. Dry parts
with compressed air.
2. Inspect internal surface of barrel for deep scratches,
out--of--roundness and bending. Replace if worn or
damaged.
3. Inspect head, shaft and piston for excessive pitting,
scoring and wear. Replace any worn or damaged parts.