Skyjack SJ1044 TH - Page 122

122
SJ1044 TH, SJ1044 THS, SJ1056 TH, SJ1056 THS, SJ1256 THS
230790ABA
Section 4 – Troubleshooting Information Hydraulic System
With following conditions:
▪
No Boom Lower
1. Stuck or defective joystick JS1
Clean valve. Check operation of valve. Repair or
replace valve as required.
2. Stuck or defective lift valve V1.
Clean valve. Check operation of valve. Repair or
replace valve as required.
3. LS check valve CV2 blocked or defective
Clean valve. Check operation of valve. Repair or
replace valve as required
4. Stuck or defective lift counterbalance valves CB2,
CB2-1.
Clean valve. Check O-rings on valve. Repair or
replace valve as required.
5. Stuck or defective lift counterbalance valves CB1,
CB1-1.
Clean valves. Check O-rings on valve. Repair or
replace valve as required.
6. Defective lift cylinder C3 and/or C4.
Check seals on cylinder. Replace as necessary.
Replace cylinder if defective
With following conditions:
▪
No Telescope Out
1. Stuck or defective joystick JS1
Clean valve. Check operation of valve. Repair or
replace valve as required.
2. PD1 V13 stuck or defective.
Clean valve. Check operation of valve. Repair or
replace valve as required.
3. Stuck or defective lift valve V3.
Clean valve. Check operation of valve. Repair or
replace valve as required.
4. LS check valve CV7 blocked or defective
Clean valve. Check operation of valve. Repair or
replace valve as required
5. Stuck or defective lift counterbalance valves CB3
Clean valve. Check O-rings on valve. Repair or
replace valve as required.
6. Stuck or defective lift counterbalance valves CB4
Clean valves. Check O-rings on valve. Repair or
replace valve as required.
7. Defective telescope cylinder C5
Check seals on cylinder. Replace as necessary.
Replace cylinder if defective
With following conditions:
▪
No Telescope Retract
1. Stuck or defective joystick JS1
Clean valve. Check operation of valve. Repair or
replace valve as required.
2. Stuck or defective telescope valve V3.
Clean valve. Check operation of valve. Repair or
replace valve as required.
3. LS check valve CV3 blocked or defective
Clean valve. Check operation of valve. Repair or
replace valve as required