SECTION 5 - BASIC HYDRAULIC INFOR
M
ATION AND SCHE
M
ATICS
5-88
3121160
DISASSEMBLY
1.
Remove the four screws (C300) holding the control
housing onto the end cap.
2.
Remove the control and discard the three interface O-
rings (C200).
3.
Remove the Pressure Compensator set screw (C102),
Pressure Compensator adjustment screw (C138),O-ring
(C136), springs (C135, C134), and seat (C133). Discard
the o-ring.
4.
Remove the plug (C103), o-ring (C103A),and Pressure
Compensator spool (C132) from the control housing;
discard the o-ring. Note orientation of the spool for reas-
sembly.
5.
Remove the plug (C107) and o-ring (C107A); discard the
o-ring.
NOTE:
For Pressure Compensator only controls, skip steps 6 and 7.
6.
Remove the Load Sense set screw (C102), Load Sense
adjustment screw (C118), o-ring (C116), backup rings
(C117), springs (C114, C115), and seat (C113); discard the
o-ring.
7.
Remove the plug (C106), O-ring (C106A), and Load
Sense spool (C112) from the control housing; discard the
o-ring. Note orientation of the spool for reassembly.
INSPECTION
1.
Inspect the adjustment screws for wear at the tips and
where they contact the springs; replace as necessary
2.
Inspect the springs and spring guides for wear or dam-
age; replace as necessary.
3.
Carefully inspect the spools. Ensure the sealing lands are
free of nicks and scratches. Check the ends that contact
the spring guides for wear. Replace spools as necessary.
4.
Inspect the control housing for damage. Check the
spool bores for excessive wear.
5.
Clean all parts and lubricate spools, springs, guides and
new o-rings with clean hydraulic fluid.
REASSEMBLY
1.
Install the Pressure Compensator spool, spherical end
first, into the Pressure Compensator bore. The Pressure
Compensator spool is the shorter of the two. Using a
new o-ring, install the plug (C103). Torque to 8-10 ft. lbs.
(11-14 Nm).
2.
Place the two Pressure Compensator springs onto the
spring guide and install into the Pressure Compensator
bore. Place a new o-ring onto the Pressure Compensator
adjustment screw and thread it into the Pressure Com-
pensator bore until flush, then make another full turn.
Install and torque the set screw to 6-8 ft. lbs. (7-11 Nm).
NOTE:
For Pressure Compensator only controls, skip steps 15 and
16.
3.
Install the Load Sense spool, spherical end first, into the
Load Sense bore. The Load Sense spool is the longer of
the two. Using a new o-ring, install the plug (C106).
Torque to 8-10 ft. lbs. (11-14 Nm).
4.
Place the two Load Sense springs onto the spring guide
and install into the Load Sense bore. Place a new o-ring
and backup rings onto the Load Sense adjustment
screw and thread it into the Load Sense bore until flush,
then make another full turn. Install and torque the set
screw to 6-8 ft. lbs. (7-11 Nm).
5.
Using a new o-ring, install the plug (C107). Torque to 8-
10 ft. lbs. (11-14 Nm).
6.
Using petroleum jelly to retain them, install the three
interface o-rings (C200) in the recesses on the control
housing.
7.
Install the control assembly onto the endcap using the
four screws (C300). Torque to 11-13 ft. lbs.
(15-18 Nm). Torque screws in a criss-cross pattern and
re-torque the first screw to ensure proper torque reten-
tion.
8.
Check and adjust the control setting. See Adjustments.
Summary of Contents for 740AJ
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Page 116: ...SECTION 3 CHASSIS TURNTABLE 3 64 3121160 Figure 3 44 Swing Hub Prior to SN 0300074383...
Page 203: ...SECTION 3 CHASSIS TURNTABLE 3121160 3 151 Figure 3 77 EFI Component Location...
Page 206: ...SECTION 3 CHASSIS TURNTABLE 3 154 3121160 Figure 3 78 ECM EPM Identification ECM EPM...
Page 224: ...SECTION 3 CHASSIS TURNTABLE 3 172 3121160 Figure 3 83 Deutz EMR 2 Troubleshooting Flow Chart...
Page 228: ...SECTION 3 CHASSIS TURNTABLE 3 176 3121160 Figure 3 87 EMR 2 Engine Plug Pin Identification...
Page 229: ...SECTION 3 CHASSIS TURNTABLE 3121160 3 177 Figure 3 88 EMR 2 Vehicle Plug Pin Identification...
Page 230: ...SECTION 3 CHASSIS TURNTABLE 3 178 3121160 Figure 3 89 EMR2 Fault Codes Sheet 1 of 5...
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Page 303: ...SECTION 4 BOOM PLATFORM 3121160 4 31 Figure 4 20 Rotator Assembly HELAC...
Page 460: ...SECTION 5 BASIC HYDRAULIC INFORMATION AND SCHEMATICS 5 116 3121160 NOTES...
Page 467: ...SECTION 6 JLG CONTROL SYSTEM 3121160 6 7 Figure 6 2 ADE Block Diagram...
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Page 580: ...SECTION 7 BASIC ELECTRICAL INFORMATION SCHEMATICS 7 46 3121160 NOTES...
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