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MAINTENANCE
F-4139 01/11 Maintenance Section 3-2
© 2011 Alamo Group Inc.
MAINTENANCE
CYLINDER SERVICE
Cylinder are designed to be reliable and easy to service. If
a cylinder should malfunction during warranty period,
return complete cylinder assembly, without disassembling,
to your authorized service department for instructions.
Unauthorized disassembly of a cylinder in warranty period
will VOID WARRANTY.
Following is an outline procedure for disassembling and
reassembling cylinders.
CYLINDER DISASSEMBLY
1. Hold cylinder tube (13) stationary and pull wire ring
(14) out through slot. Rotate head (6) to ease
disassembly.
2. Pull shaft (1), with all assembled parts, out of cylinder
tube.
NOTE: Resistance will be felt until piston seal (10) slides
over wire retaining ring groove. Seal is usually damaged
when cylinder is disassembled.
3. Remove lock nut (12) from end of shaft and slide
piston (8) and cylinder head (6) off shaft.
4. Remove piston wear ring (11), piston seal (10) and o-
ring (9) from outside grooves on piston (Swing
cylinders have additional steel ring between piston
and nut).
5. Remove wiper seal (2), rod seal (3) and wear ring (7)
from inside of cylinder head and o-ring (5) with backup
washer (4) from groove on outside of head.
6. Clean all parts including cylinder tube, in a suitable
cleaning solvent, then use air pressure to blow any
dirt or excess solvent from all parts.
7. Examine all parts for wear or damage and replace, if
necessary.
CYLINDER ASSEMBLY
NOTE: Be careful not to damage seals and o-rings on
edges or holes in cylinder tube. Inspect and remove burrs
and sharp edges if necessary before reassembly.
1. Place rod seal (3) into groove inside cylinder head.
NOTE: Lips of seal (3) must face inward and seal must be
firmly seated in groove. For easier installation, place seal
(3) in 120°F water to warm seal.
2. Install wiper seal (2) with lip of seal facing out and
flush with top of cylinder head. Install wear ring (7)
inside other end of head.
3. Place o-ring (5) with backup washer (4) in groove on
outside of head. Backup washer must be on rod side.
4. Remove sharp edges on outer edge of threaded end
of shaft (1). Lubricate wiper seal (2) and rod seal (3) in
head and carefully slide head onto shaft.
5. Place o-ring (9), piston seal (10) and piston wear ring
(11) in grooves on outside of piston.
NOTE: For easier installation, place piston seal (10) in
120°F water to warm seal.
6. Slide piston onto threaded end of shaft and install lock
nut (12). Swing, bucket and stabilizers cylinders;
tighten lock nut (12) to 300 ft./lbs. Lift and dipperstick
cylinders; tighten lock nut (12) to 375 ft./lbs. on lift
cylinders.
7. Lubricate piston wear ring (11) and piston seal (10) on
piston, o-ring (5) and backup washer (4) on head and
inside of cylinder tube (13), then carefully slide piston
and head into cylinder tube.
8. Insert wire retaining ring (14) into slot in cylinder tube
(13). Apply pressure to wire ring to thread it into
groove while turning cylinder head.