Service Manual

Rev. J
Greensmaster 3250--D
Hydraulic System (Rev. I)
Page 4 -- 115
Disassembly (Figs. 82 and 83)
IMPORTANT: To prevent damage when clamping
cylinderbarrelinavise,clamponlyonpivot end.Do
not clamp the vise jaws against the shaft surface.
1. Pump oil out of cylinder into a drain pan by slowly
moving rod in and out of cylinder bore. Plug ports and
clean outside of cylinder.
2. Mount cylinder in a vise by clamping vise on center
mountinglocationofcylinder.Donotclosevisesofirmly
that cylinder barrel could become distorted.
3. Remove both heads from the barrel:
A. For serial numbers below 260999999, loosen
setscrewsandremovethreadedcapfromeachend
of the cylinder barrel.
B. For serial numbers above 270000000, use a
spanner wrench to rotate head clockwise until the
edge of the retaining ring appears in the barrel
opening. Insert a screwdriver under the beveled
edge of the retaining ring to start the retaining ring
through the opening. Rotate the head counter--
clockwise to remove r etaining ring from barrel and
head.
C. Grasp end of rod and use a twisting and pulling
motion to carefully extract rod assembly and head
from cylinder barrel. Remove head from other end
of barrel.
4. For serial numbers below 260999999, loosen set
screws that secure piston to shaft and carefully remove
piston. Slide head and threaded cap from shaft. Piston
for serial numbers above 270000000 is not removable
from shaft.
5. Remove and discard all accessible seals, back--up
rings, and O--rings from piston and both heads.
CAUTION
Useeyeprotectionsuchasgoggles whenusing
compressed air to dry cylinder parts.
6. 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.
7. Carefully inspect internal surface of barrel for dam-
age (deep scratches, out--of--round, etc.). Replace en-
tire cylinder if barrel is damaged. Inspect shaft, both
heads,andpistonforevidenceofexcessivescoring,pit-
ting, or wear. Replace any damaged parts.
Assembly (Figs. 82 and 83)
NOTE: Due to steering cylinder design for serial num-
bersabove270000000,thesealkitmayincludeseveral
O--rings,backupringsandwearringsthatcannotbeac-
cessed.
1. Puta coating of clean hydraulic oil on all newseals,
back--uprings,andO--ringsthataretobeinstalledincyl-
inder.
2. Install new u--cup, rod wiper, back up ring, and O--
ringontoeachhead.PositionO--ring(s),pistonring,and
both wear rings to the piston.
3. For serial numbers below 260999999, lubricate
shaft,balljointendheadand pistonwithcleanhydraulic
oil. Carefully slide ball joint end head and then piston
ontoshaft.Installthreadlockeronsetscrewthreadsand
tighten two set screws to secure piston to shaft.
4. Lubricate shaft assembly with clean hydraulic oil
and carefully slide shaft assembly into cylinder barrel.
5. Lubricate non--ball joint end head assembly with
clean hydraulic oil and carefully slide it onto shaft and
into barrel.
6. Secure heads to barrel:
A. For serial numbers below 260999999, install
andtightenthreadedcaps.Securebothcapstobar-
rel with set screws.
B. For serial numbers above 270000000, align re-
taining ring hole in the head with the access slot in
thebarrel.Inserttheretainingringhookintothehole
and rotate head clockwise until the retaining ring is
completely pulled into the barrel and the ring ends
are covered. Apply silicone sealer to barrel access
slot.
Hydraulic
System