Toro Multi Pro 1750 Service Manual page 89

Disassembling the Steering Cylinder (Fig. 32)
1. Remove oil 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. Do not close vise
enough to distort the barrel.
2. Mount end of steering cylinder in a vise with soft
jaws. Remove retaining ring.
A. Use a spanner wrench to rotate head (item 9)
clockwise until the edge of the retaining ring appears
in the barrel opening.
B. Insert a screwdriver under the beveled edge of
the retaining ring (item 14) to start the retaining ring
through the opening.
C. Rotate the head counter−clockwise to remove re-
taining ring through slot in barrel.
D. Repeat steps A. thru C. for remaining head.
3. Use a twisting and pulling motion to carefully extract
the head assembly from the front shaft and barrel.
4. Grasp the end of the trunnion shaft and use a twisting
and pulling motion to carefully extract the trunnion shaft,
trunnion head, piston and front shaft assembly from the
barrel.
5. Remove cylinder from vise.
IMPORTANT: When removing roll pin from front and
trunnion shafts, make sure that shaft surfaces are
not damaged.
6. Remove roll pin (item 4) that secures front shaft to
trunnion shaft, then remove front shaft, piston and rear
head from trunnion shaft. Retain the 1/8" x 7/8" roll pin
for reassembly.
7. Remove and discard seals, O−rings and wear ring
from piston and heads.
Inspecting the Steering Cylinder
1. Wash all cylinder parts in clean solvent. Dry parts
with compressed air. Do not wipe parts dry with paper
towels or cloth. Lint in the hydraulic system will cause
damage.
2. Carefully inspect internal surface of barrel for dam-
age (deep scratches, out−of−round, etc.).
Multi Pro 1750
3. Inspect shaft and piston for evidence of excessive
scoring, pitting or wear.
4. Replace steering cylinder if internal components are
found to be worn or damaged.
Assembling the Steering Cylinder (Fig. 32)
1. Use a new seal kit to replace all seals, O−rings and
wear ring to piston and heads. Apply clean Dexron III
ATF to all seal kit components before installing.
2. Install trunnion head with new seals onto trunnion
shaft.
IMPORTANT: Make sure to not damage O−ring as
piston is installed over roll pin hole in trunnion
shaft.
3. Install piston with new seals and back−ups onto trun-
nion shaft.
IMPORTANT: When installing roll pin into front and
trunnion shafts, make sure that shaft surfaces are
not damaged.
4. Slide front shaft onto trunnion shaft and align roll pin
holes in shafts. Install the 1/8" x 7/8" roll pin to secure
shafts.
IMPORTANT: Prevent damage when clamping the
cylinder's barrel into a vise; clamp on the clevis
only. Do not close vise on barrel.
5. Mount steering cylinder in a vise equipped with soft
jaws by clamping on the barrel clevis.
6. Coat all cylinder components with clean Dexron III
ATF. Slide shaft assembly into barrel, being careful to
not damage seals during installation.
7. Insert front head assembly into the barrel being care-
ful to not damage head seals during installation.
8. Secure front and trunnion heads in barrel with retain-
ing rings.
A. Align retaining ring hole in the head with the ac-
cess slot in the barrel.
B. Insert the retaining ring hook into the hole and ro-
tate head clockwise until the retaining ring is com-
pletely pulled into the barrel and the ring ends are
covered.
C. Apply silicone sealer to tube access slot.
Page 4 − 41 Hydraulic System