Telescopic Boom Series
Models SJ61T & SJ66T
194312
December 2007
Page 141
Section 4 - Troubleshooting Information
Service and Maintenance
-
Clean valve. Check O-rings on valve. Check operation of valve. Repair or replace valve as
required.
4.
Stuck or defective check valve CV4.
-
Clean valve. Check O-rings on valve. Check operation of valve. Repair or replace valve as
required.
5. Stuck or defective relief valve RV2.
-
Set valve to specifications. Check O-rings and clean valve. Repair or replace valve as required.
6.
Stuck or defective shuttle valve SV7.
-
Clean valve. Check O-rings on valve. Check operation of valve. Repair or replace valve as
required.
7.
Stuck or defective counterbalance valve CB1.
-
Clean valve. Check O-rings on valve. Repair or replace valve as required.
8.
Turret rotate brake BR1 not releasing.
-
Inspect brake for worn seals or broken components. Repair and replace as necessary.
9.
Worn or defective swing drive motor M2.
-
Check motor. Repair or replace if defective.
4.2-7 No Boom Extend
1.
Stuck or defective differential sensing valve DSV3.
-
Clean valve. Check O-rings on valve. Check operation of valve. Repair or replace valve as
required.
2.
Stuck or defective boom extend valve 3H-39.
-
Clean valve. Check operation of valve. Repair or replace valve as required.
3.
Stuck or defective check valve CV11.
-
Clean valve. Check O-rings on valve. Check operation of valve. Repair or replace valve as
required.
4.
Stuck or defective check valve CV6.
-
Clean valve. Check O-rings on valve. Check operation of valve. Repair or replace valve as
required.
5. Stuck or defective relief valve RV4.
-
Set valve to specifications. Check O-rings and clean valve. Repair or replace valve as required.
6.
Return valve V5 stuck in the open position.
-
Clean valve. Check operation of valve. Repair or replace valve as required.
7.
Stuck or defective counterbalance valve CB4.
-
Clean valve. Check O-rings on valve. Repair or replace valve as required.
8.
Return valve V4 stuck in the closed position or is defective.
-
Clean valve. Check operation of valve. Repair or replace valve as required.
9.
Defective extension cylinder C2.
-
Check seals on cylinder. Replace as necessary. Replace cylinder if defective.
4.2-8 No Boom Retract
1.
1. Stuck or defective differential sensing valve DSV3.
-
Clean valve. Check O-rings on valve. Check operation of valve. Repair or replace valve as
required.
2.
Stuck or defective boom retract valve 3H-38.
-
Clean valve. Check operation of valve. Repair or replace valve as required.
3.
Stuck or defective check valve CV10.
-
Clean valve. Check O-rings on valve. Check operation of valve. Repair or replace valve as
required.
4.
Stuck or defective check valve CV6.
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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