User manual

Groundsmaster 4000--D/4010--D Hydraulic SystemPage 4 -- 117
Disassembly (Fig. 88)
1. Pumpoil outofcylinder into adrainpan by SLOWLY
moving rod and piston in and out of cylinder bore. Plug
ports and clean outside of cylinder.
IMPORTANT: To prevent damage when clamping
cylinder in a vise, clamp only on pivotal ends. Use
of a vise with soft jaws is recommended.
2. Mountcylinderinavisesorodendofcylinderistilted
up slightly. Do not close vise so firmly that cylinder tube
could become distorted.
3. Loosen head from tube:
A. Use a spanner wrench to rotate head clockwise
untiltheedgeoftheretainingringappearsinthetube
opening.
B. Insert a screwdriver under the beveled edge of
the retaining ring to start the retaining ring through
the opening.
C. Rotatetheheadcounter--clockwisetoremovere-
taining ring from tube and head.
4. Grasp end of piston rod and use a twisting and pull-
ing motion to carefully extract piston, piston rod and
head from cylinder tube.
IMPORTANT: Do notclampvisejawsagainst piston
rod surface; the piston rod will be damaged.
5. Securely mount piston, piston rod and head assem-
bly into vise with soft jaws.
6. Removeset screws that secure piston to piston rod.
Removepistonfrompistonrodandthenslideheadfrom
rod.
7. Remove and discard all seals and O--rings from
head and piston.
CAUTION
Use eye protection such as goggles when using
compressed air to dry cylinder components.
8. Wash parts in clean solvent. Dry parts with com-
pressed 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.). Replace en-
tirecylinder ifbarrelisdamaged. Inspect rod and piston
for evidence of excessive scoring, pitting or wear. Re-
place any damaged parts.
Assembly (Fig. 88)
1. Use a complete repair kit when rebuilding the cylin-
der. Put a coating of clean hydraulic oil on all new seals
and O--rings.
2. InstallnewO--ringsandsealstothepistonandhead.
3. Lubricate shaft with clean hydraulic oil. Slide head
onto shaft.
4. Install and tighten piston onto shaft. Torque piston
from 45 to 55 ft--lb (62 to 74 N--m).
5. ApplyLoctite #242 (or equivalent) to set screws and
install set screws into piston. Torque set screws from 5
to 7 ft--lb (7 to 9 N--m).
6. Put a coating of clean hydraulic oil on all cylinder
parts to ease assembly.
7. Slide r od assembly into cylinder tube.
IMPORTANT: To prevent damage when clamping
cylinder in a vise, clamp only on pivotal ends. Use
of a vise with soft jaws is recommended.
8. Mount steering cylinder in a vise with s oft jaws. Se-
cure head in barrel:
A. Align retaining ring hole in the head with the ac-
cess slot in the tube.
B. Inserttheretainingringhookintotheholeandro-
tate head clockwise until the retaining ring is com-
pletely pulled into the tube and the ring ends are
covered.
C. Apply silicone sealer to tube access slot.
Hydraulic
System