Skyjack SJ82 T - 12 Brake will Not Release; 13 Brake will Not Engage

154
SJ82 T, SJ86 T
229040ABA
Section 4 – Troubleshooting Information Hydraulic System
1. Stuck or defective platform level down 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 opera-
tion of valve. Repair or replace valve as required.
3. Stuck or defective check valve CV7. Clean valve. Check O-rings on valve. Check opera-
tion of valve. Repair or replace valve as required.
4. Stuck or defective shuttle valve SV3. Clean valve. Check O-rings on valve. Check opera-
tion 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 CB7. 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 defec-
tive.
8. Defective leveling cylinder C3 or slave cylinder
C4.
Check seals on cylinder. Replace as necessary.
Replace cylinder if defective.
4.3-12 Brake will not Release
1. Stuck or defective shuttle valve SV5. Clean valve. Check O-rings on valve. Check opera-
tion of valve. Repair or replace valve as required.
2. Defective or misadjusted pressure reducing valve
PR1.
Set valve to specifications. Check O-rings and
clean valve. Repair or replace valve as required.
3. Stuck or defective brake valve 3H-26. Clean valve. Check O-rings on valve. Check opera-
tion of valve. Repair or replace valve as required.
4. Stuck or defective shuttle valve SV6. Clean valve. Check O-rings on valve. Check opera-
tion of valve. Repair or replace valve as required.
5. Defective or misadjusted relief valve RV5. Set valve to specifications. Check O-rings and
clean valve. Repair or replace valve as required.
6. Stuck or defective brake release override valve
V1.
Clean valve. Check O-rings on valve. Repair or
replace valve as required.
7. Bypassing or defective brake hand pump V3. Clean valve. Check O-rings on valve. Repair or
replace valve as required.
8. Bypassing or defective brake cylinder BR1. Check seals on cylinder. Replace as necessary.
Replace cylinder if defective.
4.3-13 Brake will not Engage
1. Brake return spring or defective cylinder. Check cylinder. Repair or replace as necessary.
2. Brake valve 3H-26 stuck in shifted position. Check valve. Replace if defective.
3. Brake in axle out of adjustment. See section 5 for brake adjustment procedure.
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