Telescopic Boom Series
Models SJ61T & SJ66T
194312
December 2007
Page 143
Section 4 - Troubleshooting Information
Service and Maintenance
5. Defective rotary actuator RA1.
-
Check actuator. Repair or replace as necessary.
4.2-12 No Platform Rotation Left
1.
Stuck or defective proportional flow enable valve 2H-42.
-
Clean valve. Check O-rings on valve. Check operation of valve. Repair or replace valve as
required.
2.
Stuck or defective check valve CV9.
-
Clean valve. Check O-rings on valve. Check operation of valve. Repair or replace valve as
required.
3.
Stuck or defective rotate left valve 4H-36.
-
Clean valve. Check operation of valve. Repair or replace valve as required.
4.
Stuck or defective counterbalance valve CB10.
-
Clean valve. Check O-rings on valve. Repair or replace valve as required.
5. Defective rotary actuator RA1.
-
Check actuator. Repair or replace as necessary.
4.2-13 Platform will not Level Down
1.
Stuck or defective platform level down valve 4H-40.
-
- 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 CV8.
-
Clean valve. Check O-rings on valve. Check operation of valve. Repair or replace valve as
required.
4.
Stuck or defective shuttle valve SV3.
-
Clean valve. Check O-rings on valve. Check operation of valve. Repair or replace valve as
required.
5. Stuck or defective relief valve RV3.
-
Set valve to specifications. Check O-rings and clean valve. Repair or replace valve as required.
6.
Stuck or defective counterbalance valve CB6.
-
Clean valve. Check O-rings on valve. Repair or replace valve as required.
7.
Plugged orifice OR2.
-
Check orifice. Clean if plugged or replace if defective.
8.
Defective leveling cylinder C3 or slave cylinder C4.
-
Check seals on cylinder. Replace as necessary. Replace cylinder if defective.
4.2-14 Platform will not Level Up
1.
Stuck or defective platform level up valve 4H-41.
-
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 CV7.
-
Clean valve. Check O-rings on valve. Check operation of valve. Repair or replace valve as
required.
4.
Stuck or defective shuttle valve SV3.
-
Clean valve. Check O-rings on valve. Check operation of valve. Repair or replace valve as
required.
5. Stuck or defective relief valve RV3.
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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