SERVICE 1400H OPERATOR AND SERVICE MANUAL
5-16 Published 10-30-2014 Control # 040-09
SINGLE STAGE CYLINDER DISASSEMBLY AND REPAIR
1. Disconnect shaft end of cylinder from machine.
2. Retract cylinder shaft with oil from the hydraulic system
until about 12 in (30 cm) of shaft is extended. The barrel
must be filled with oil to prevent a compressed air
chamber being formed which could result in injury at
disassembly.
3. Remove the cylinder from the machine and place on
supports with an oil pan directly beneath the cylinder
head area.
4. Using the proper size of internal snap ring pliers,
compress the snap ring completely and remove from
groove.
5. Attach a porta power hand pump or hydraulic line from
crane circuit valve to the shaft end of the cylinder.
Deburr snap ring groove edge. Failure to do so will
damage barrel or packing gland.
6. Operate hand pump or crane circuit valve, preferably the
boom telescope circuit, to force packing gland out of
barrel.
7. Remove the shaft and piston assembly by hand.
8. Disassemble the piston set by removing nut, replace
worn or damaged parts. Note: Loctite 680 is used during
original assembly to secure nut to shaft. If necessary,
heat nut to 400-500°F (204-260°C) to facilitate removal.
If heat is necessary for removal, discard nut and replace
with new equivalent nut as well as worn or damaged
parts.
9. Wipe and inspect cylinder barrel for internal damage.
10. Wipe and inspect cylinder shaft for damage.
11. Remove shaft packing by removal of internal snap ring
from packing gland. If spiral rings are used, they will
have to be replaced each time they are removed.
Replace parts as required.
12. Lubricate piston head snap ring at O-ring seal area
removing all nicks that have been formed at the snap
ring area that would damage the O-ring before
installation.
13. Reassemble shaft and piston set assembly. Loctite nut
onto shaft using type 680 according to Loctite
recommendations.
14. Reinstall shaft and head assembly being sure that snap
ring expands completely and properly into the snap ring
head groove.
PRESSURE LINE FROM PORTA-
POWER OR HYDRAULIC LINE
FROM CRANE CIRCUIT VALVE
READ PARAGRAPH 5 & 6 BEFORE
PERFORMING THIS STEP
SNAP RING
WASHER
SNAP RING
SHAFT EXTENDED
CYLINDER BARREL
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