Toro Groundsmaster 3500 30807 - Page 179

Groundsmaster 3500 Hydraulic SystemPage 5 − 121
Disassembly
1. Remove hydraulic fluid from the steering cylinder
into a drain pan by slowly pumping the cylinder shaft.
Plug both ports and clean the outside of the cylinder.
IMPORTANT: Prevent damage when clamping the
hydraulic cylinder into a vise; clamp on the clevis
only.
2. Mount clevis end of steering cylinder in a vice. Re-
move retaining ring.
3. Remove plugs from ports. Extract shaft, cylinder
gland, and piston by carefully twisting and pulling on the
shaft.
IMPORTANT: Do not clamp vise jaws against the
shaft surface. Protect shaft surface before mount-
ing in a vice.
4. Mount shaft securely in a vise by clamping on the cle-
vis of the shaft. Remove lock nut and piston from the
shaft. Slide cylinder gland off the shaft.
5. Remove Uni−ring and O–ring from the piston.
6. Remove back−up ring, O–rings, and rod seal from
the cylinder gland.
Inspection
Carefully inspect internal surface of cylinder barrel for
damage (deep scratches, out−of−round, etc.). Inspect
piston rod for straightness, excessive scoring, and pit-
ting or wear. Inspect piston and head for evidence of ex-
cessive scoring and pitting or wear. Replace entire
cylinder assembly if necessary.
Assembly
1. Make sure all parts are clean before reassembly.
2. Coat new O–rings, Uni−ring, rod seal, and back−up
ring with with clean hydraulic fluid.
A. Install Uni−ring and O–ring to the piston.
B. Install O–rings, back−up ring, and rod seal to the
cylinder gland.
IMPORTANT: Do not clamp vise jaws against the
shaft surface. Protect shaft surface before mount-
ing in a vice.
3. Mount shaft securely in a vise by clamping on the cle-
vis of the shaft.
A. Coat shaft with a light coat of clean hydraulic fluid.
B. Slide cylinder gland assembly onto the shaft.
Install piston and lock nut onto the shaft. Torque nut
from 40 ft−lb (54 N−m).
C. Remove shaft from the vise.
IMPORTANT: Prevent damage when clamping the
hydraulic cylinder into a vise; clamp on the clevis
only.
4. Mount clevis of the barrel in a vice.
5. Coat all internal parts with a light coat of clean hy-
draulic fluid. Slide piston, shaft, and cylinder gland as-
sembly into the barrel being careful not to damage the
seals.
6. Secure head into the barrel with the retaining ring.
Hydraulic
System