Skyjack SJ1044 TH - Park Brake will Not Engage; Service Brake will Not Engage; 10 Outriggers Inoperative

126
SJ1044 TH, SJ1044 THS, SJ1056 TH, SJ1056 THS, SJ1256 THS
230790ABA
Section 4 – Troubleshooting Information Hydraulic System
4.3-8 Park Brake Will Not Engage
3. Defective park brake C11. Repair or replace as necessary.
4. Park brake valve SV3 stuck in shifted position. Check valve. Replace if defective.
4.3-9 Service Brake Will Not Engage
1. Service brake actuator stuck or defective
Clean valve. Check operation of valve. Repair or
replace valve as required
2. Load sense check valve CV6 blocked or defective
Clean valve. Check operation of valve. Repair or
replace valve as required
3. Bypassing or defective brake seals in axle.
Check seals, replace as necessary. Replace if
defective
4. PR2 pressure reducing valve misadjusted or
defective (SJ1256 THS only)
Adjust pressure, replace if defective
4.3-10 Outriggers Inoperative
With following conditions:
▪
Right outriggers up and/or down Inoperative
1. Stuck or defective right outrigger valve V28 (4H-
225 and 4H-226).
Clean valve. Check operation of valve. Repair or
replace valve as required.
2. LS check valve CV19 blocked or defective
Clean valve. Check operation of valve. Repair or
replace valve as required
3. Stuck or defective counterbalance valves CB10
Clean valve. Check O-rings on valve. Repair or
replace valve as required.
4. Stuck or defective lift counterbalance valves
CB11
Clean valves. Check O-rings on valve. Repair or
replace valve as required.
5. Defective telescope cylinder C11.
Check seals on cylinder. Replace as necessary.
Replace cylinder if defective
With following conditions:
▪
Left outriggers up and/or down inoperative
1. Stuck or defective left outrigger valve V25 (4H-
227 and 4H-228).
Clean valve. Check operation of valve. Repair or
replace valve as required.
2. LS check valve CV18 blocked or defective
Clean valve. Check operation of valve. Repair or
replace valve as required
3. Stuck or defective counterbalance valves CB8
Clean valve. Check O-rings on valve. Repair or
replace valve as required.
4. Stuck or defective lift counterbalance valves CB9
Clean valves. Check O-rings on valve. Repair or
replace valve as required.
5. Defective telescope cylinder C10.
Check seals on cylinder. Replace as necessary.
Replace cylinder if defective