152
SJ82 T, SJ86 T
229040ABA
Section 4 – Troubleshooting Information
Hydraulic System
4.3-9 No Jib Down
1.
Stuck or defective proportional flow enable valve
2H-42.
Clean valve. Check O-rings on valve. Check opera-
tion of valve. Repair or replace valve as required.
2.
Stuck or defective check valve CV9.
Clean valve. Check O-rings on valve. Check opera-
tion of valve. Repair or replace valve as required.
3.
Stuck or defective jib up valve 4H-34.
Clean valve. Check operation of valve. Repair or
replace valve as required.
4.
Stuck or defective counterbalance valve CB8.
Clean valve. Check O-rings on valve. Repair or
replace valve as required.
5.
Defective jib cylinder C5.
Check seals on cylinder. Replace as necessary.
Replace cylinder if defective.
4.3-10 No Platform Rotation
Right Rotation
1.
Stuck or defective proportional flow enable valve
2H-42.
Clean valve. Check O-rings on valve. Check opera-
tion of valve. Repair or replace valve as required.
2.
Stuck or defective check valve CV9.
Clean valve. Check O-rings on valve. Check opera-
tion of valve. Repair or replace valve as required.
3.
Stuck or defective jib up valve 4H-37.
Clean valve. Check operation of valve. Repair or
replace valve as required.
4.
Stuck or defective counterbalance valve CB11.
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.
Left Rotation
1.
Stuck or defective proportional flow enable valve
2H-42.
Clean valve. Check O-rings on valve. Check opera-
tion of valve. Repair or replace valve as required.
2.
Stuck or defective check valve CV9.
Clean valve. Check O-rings on valve. Check opera-
tion of valve. Repair or replace valve as required.
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