SECTION 5 - HYDRAULICS
5-16
– JLG Lift –
3121827
6.
Inspect piston surface for damage and scoring and
for distortion. Dress piston surface or replace piston
as necessary.
7.
Inspect threaded portion of piston for damage.
Dress threads as necessary.
8.
Inspect seal and o-ring grooves in piston for burrs
and sharp edges. Dress applicable surfaces as nec-
essary.
9.
Inspect cylinder head inside diameter for scoring or
other damage and for ovality and tapering. Replace
as necessary.
10.
Inspect threaded portion of head for damage. Dress
threads as necessary.
11.
Inspect seal and o-ring grooves in head for burrs
and sharp edges. Dress applicable surfaces as nec-
essary.
12.
Inspect cylinder head outside diameter for scoring
or other damage and ovality and tapering. Replace
as necessary.
13.
If applicable, inspect rod and barrel bearings for
signs of correct excessive wear or damage. Replace
as necessary.
a. Thoroughly clean hole, (steel bushing) of burrs,
dirt etc. to facilitate bearing installation.
b. Inspect steel bushing for wear or other damage.
If steel bushing is worn or damaged, rod/barrel
must be replaced.
c. Lubricate inside of the steel bushing with WD40
prior to bearing installation.
d. Using an arbor of the correct size, carefully
press the bearing into steel bushing.
NOTE:
Install pin into the Gar-Max bearing dry. Lubrication
is not required with nickel plated pins and bearings.
14.
Inspect travel limiting collar or spacer for burrs and
sharp edges. If necessary, dress inside diameter
surface with Scotch Brite or equivalent.
15.
If applicable, inspect port block fittings and holding
valve. Replace as necessary.
16.
Inspect the oil ports for blockage or the presence of
dirt or other foreign material. Repair as necessary.
17.
If applicable, inspect piston rings for cracks or other
damage. Replace as necessary.
Assembly
NOTE:
Prior to cylinder assembly, ensure that the proper
cylinder seal kit is used. See your JLG Parts Manual.
Apply a light film of hydraulic oil to all components
prior to assembly.
1.
A special tool is used to install a new rod seal into
the applicable cylinder head gland groove.
WHEN INSTALLING “POLY-PAK” PISTON SEALS, ENSURE SEALS
ARE INSTALLED PROPERLY. REFER TO WIPER SEAL INSTALLA-
TION FOR CORRECT SEAL ORIENTATION. IMPROPER SEAL
INSTALLATION COULD RESULT IN CYLINDER LEAKAGE AND
IMPROPER CYLINDER OPERATION.
Figure 5-15. Gar-Max Bearing
Figure 5-16. Rod Seal Installation
Summary of Contents for JLG E400AJP
Page 2: ......
Page 32: ...SECTION 1 SPECIFICATIONS 1 18 JLG Lift 3121827 NOTES...
Page 42: ...SECTION 2 GENERAL 2 10 JLG Lift 3121827 NOTES...
Page 54: ...SECTION 3 CHASSIS TURNTABLE 3 12 JLG Lift 3121827 Figure 3 3 Speed Sensor Orientation...
Page 60: ...SECTION 3 CHASSIS TURNTABLE 3 18 JLG Lift 3121827 Figure 3 7 Steering Components and Spindles...
Page 62: ...SECTION 3 CHASSIS TURNTABLE 3 20 JLG Lift 3121827 Figure 3 9 Tilt Sensor Location...
Page 86: ...SECTION 3 CHASSIS TURNTABLE 3 44 JLG Lift 3121827 Figure 3 16 Swing Components...
Page 88: ...SECTION 3 CHASSIS TURNTABLE 3 46 JLG Lift 3121827 Figure 3 18 Battery Cable Connections...
Page 90: ...SECTION 3 CHASSIS TURNTABLE 3 48 JLG Lift 3121827 Figure 3 20 On Board Generator...
Page 97: ...SECTION 3 CHASSIS TURNTABLE 3121827 JLG Lift 3 55 Figure 3 22 Generator Components...
Page 116: ...SECTION 3 CHASSIS TURNTABLE 3 74 JLG Lift 3121827 NOTES...
Page 127: ...SECTION 4 BOOM PLATFORM 3121827 JLG Lift 4 11 Figure 4 10 Boom Limit Switches...
Page 140: ...SECTION 4 BOOM PLATFORM 4 24 JLG Lift 3121827 Figure 4 13 Rotator Counterbalance Valve...
Page 178: ...SECTION 5 HYDRAULICS 5 24 JLG Lift 3121827 Figure 5 26 HydraForce Cartridge Torque Value Chart...
Page 214: ...SECTION 6 JLG CONTROL SYSTEM 6 34 JLG Lift 3121827 NOTES...
Page 257: ......
