Toro Groundsmaster 4000-D Service Manual page 165

Disassembly (Fig. 85)
1. Pump oil out of steering cylinder into a drain pan by
slowly moving rod in and out of cylinder bore. After oil
has been removed from cylinder, plug ports and clean
outside of cylinder.
IMPORTANT: Prevent damage when clamping the
cylinder in a vise, clamp on the clevis only. Use of a
vise with soft jaws is recommended.
2. Mount steering cylinder securely in a vise by clamp-
ing on the clevis end of the barrel. Use of a vise with soft
jaws is recommended.
3. Use a spanner wrench to loosen and remove internal
collar (item 5) from barrel.
4. Grasp end of rod and use a twisting and pulling mo-
tion to carefully extract rod, piston and head assembly
from cylinder barrel.
IMPORTANT: Do not clamp vise jaws against rod
surface; the rod will be damaged.
5. Securely mount rod, piston and head assembly into
vise with soft jaws.
6. Remove lock nut and then piston from the rod. Slide
head and then internal collar off the rod.
7. Remove and discard all seals and O--rings from the
piston and the head.
CAUTION
Use eye protection such as goggles when using
compressed air to dry cylinder components.
8. Wash cylinder parts in clean solvent. Dry parts with
compressed air. Do not wipe parts dry with paper towels
or cloth. Lint in a hydraulic system will cause damage.
9. Carefully inspect internal surface of barrel for dam-
age (deep scratches, out--of--round, etc.). Inspect rod
and piston for evidence of excessive scoring, pitting or
wear. Replace steering cylinder if internal components
are worn or damaged.
Groundsmaster 4000--D/4010--D
Assembly (Fig. 85)
1. Use a complete repair kit when rebuilding the steer-
ing cylinder. Put a coating of clean hydraulic oil on all
new seals and O--rings.
2. Install new lubricated O--rings and seals to the piston
and head.
IMPORTANT: Do not clamp vise jaws against the
rod surface.
3. Mount rod securely in a vise by clamping on the cle-
vis of the rod.
4. Lubricate rod with clean hydraulic oil. Carefully slide
internal collar, head and then piston onto the rod.
5. Install and tighten lock nut onto rod. Torque lock nut
40 ft- -lb (54 N- -m).
6. Remove rod assembly from vise.
7. Put a coating of clean hydraulic oil on all cylinder
parts to ease assembly.
8. Carefully slide rod assembly into cylinder barrel.
IMPORTANT: Prevent damage when clamping the
cylinder in a vise, clamp on the clevis only. Use of a
vise with soft jaws is recommended.
9. Mount steering cylinder securely in a vise by clamp-
ing on the clevis end of the barrel. Use of a vise with soft
jaws is recommended.
10.Secure head in barrel by using a spanner wrench to
install and tighten internal collar (item 5) into barrel.
Page 4 - - 119 Hydraulic System