SECTION 4 - BASE COMPONENTS
4-32
– JLG Lift –
3121222
Pump Components
The following is a complete disassembly/assembly of the
machines’ pump/motor/valve assembly.
NOTE:
During reassembly of the pump/motor assembly,
lubricate all seals and o-rings with JLG recom-
mended hydraulic fluid.
Also keep all internal metal parts clean and coated
with hydraulic fluid to prevent surface corrosion.
JLG recommends replacing all seals and o-rings
when disassembling and reassembling the pump/
motor unit.
Hydraulic System Pressure Check Port
The port for hydraulic system lift pressure check is pro-
vided on the valve body of the hydraulic pump assembly
as shown in the following illustration.
Figure 4-12. Hydraulic Pump - Hydraulic Line and
Electrical Connections
1.
Steer Right - Hyd. Line
2.
Steer Left - Hyd. Line
3.
Cyl. Lift-Up - Hyd. Line
4.
Cyl. Return - Hyd. Line
5.
Cylinder Lift-Up Solenoid
6.
Steer Right Solenoid
7.
Steer Left Solenoid
8.
Pump Motor Pos (+)
9.
Pump Motor Neg (–)
Hydraulic Pressure Check Port
1.
Pump Valve Body
2.
Pressure Check Port Shown
with Optional Fitting
Summary of Contents for 1230ES
Page 1: ...AS NZS Service and Maintenance Manual Model s 1230ES P N 3121222 June 22 2017 ...
Page 2: ...NOTES ...
Page 24: ...SECTION 1 MACHINE SPECIFICATIONS 1 12 JLG Lift 3121222 NOTES ...
Page 32: ...SECTION 2 GENERAL SERVICE INFORMATION 2 8 JLG Lift 3121222 NOTES ...
Page 78: ...SECTION 4 BASE COMPONENTS 4 40 JLG Lift 3121222 NOTES ...
Page 104: ...SECTION 5 CONTROL COMPONENTS 5 26 JLG Lift 3121222 NOTES ...
Page 158: ...SECTION 8 DIAGNOSTIC TROUBLE CODES 8 22 JLG Lift 3121222 NOTES ...
Page 198: ...SECTION 9 GENERAL ELECTRICAL INFORMATION SCHEMATICS 9 40 JLG Lift 3121222 ...
Page 199: ...SECTION 9 GENERAL ELECTRICAL INFORMATION SCHEMATICS 3121222 JLG Lift 9 41 ...
Page 200: ...SECTION 9 GENERAL ELECTRICAL INFORMATION SCHEMATICS 9 42 JLG Lift 3121222 ...
Page 202: ...SECTION 9 GENERAL ELECTRICAL INFORMATION SCHEMATICS 9 44 JLG Lift 3121222 NOTES ...