Telescopic Boom Series
Models SJ61T & SJ66T
194312
December 2007
Page 145
Section 4 - Troubleshooting Information
Service and Maintenance
-
Check motor. Replace if defective.
4.2-18 No Forward Drive
1.
Defective pump displacement control 4H-16.
-
Check control. Replace if defective.
2.
Defective or misadjusted drive relief valve RV6.
-
See section 5 for drive pump set up procedures.
4.2-19 No Reverse Drive
1.
Defective pump displacement control 4H-15.
-
Check control. Replace if defective.
2.
Defective or misadjusted drive relief valve RV7.
-
See section 5 for drive pump set up procedures.
4.2-20 No High Speed Drive
1.
Stuck or defective 2 speed valve 3H-45.
-
Clean valve. Check O-rings on valve. Check operation of valve. Repair or replace valve as
required.
2.
Defective shift spool in drive motor M1.
-
Check motor. Repair or replace if necessary.
4.2-21 No Right Steer
1.
Stuck or defective right valve 4H-23A.
-
Clean valve. Check operation of valve. Repair or replace valve as required.
2.
Stuck or defective dual check valve DCV2.
-
Clean valve. Check O-rings on valve. Check operation of valve. Repair or replace valve as
required.
3.
Stuck or defective check valve CV2.
-
Clean valve. Check O-rings on valve. Check operation of valve. Repair or replace valve as
required.
4.
Plugged orifice OR1.
-
Check orifice. Clean if plugged or replace if defective.
5. Defective steer cylinder C8 for 4WD or C9 for 2WD.
-
Check seals on cylinder. Replace as necessary. Replace cylinder if defective.
4.2-22 No Left Steer
1.
Stuck or defective left steer valve 4H-24A.
-
Clean valve. Check operation of valve. Repair or replace valve as required.
2.
Stuck or defective dual check valve DCV2.
-
Clean valve. Check O-rings on valve. Check operation of valve. Repair or replace valve as
required.
3.
Stuck or defective check valve CV3.
-
Clean valve. Check O-rings on valve. Check operation of valve. Repair or replace valve as
required.
4.
Plugged orifice OR1.
-
Check orifice. Clean if plugged or replace if defective.
5. Defective steer cylinder C8 for 4WD or C9 for 2WD.
-
Check seals on cylinder. Replace as necessary. Replace cylinder if defective.
4.2-23 Axle Will Not Oscillate
NOTE
Axle will only oscillate when boom is fully retracted and is no greater
than 15 degress above horizontal.
Summary of Contents for SJ61T
Page 1: ...TELESCOPIC BOOMS MODELS SJ61T SJ66T 194312AE February 2017 SERVICE MANUAL...
Page 42: ...Page 42 December 2007 Telescopic Boom Series Models SJ61T SJ66T 194312 Notes...
Page 230: ...Page 230 December 2007 Telescopic Boom Series Models SJ61T SJ66T 194312 Notes...
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