Skyjack SJ85 AJ Service Manual

138
SJ85 AJ229044ADA
Section 4 – Troubleshooting Information Hydraulic System
4.3-12 No Brake Function
Brake will not Release:
1. Stuck or defective shuttle valve SV2. Clean valve. Check O-rings on valve. Check
operation 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
operation of valve. Repair or replace valve as
required.
4. Stuck or defective shuttle valve SV6. Clean valve. Check O-rings on valve. Check
operation 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 piston on front or
rear axle C9 or C10.
Check seals on pistons (axle oil level overfull).
Replace as necessary.
Brake will not Engage:
1. Brake return spring or defective cylinder. Check cylinder. Repair or replace as necessary.
2. Stuck or defective brake valve 3H-26. Clean valve. Check O-rings on valve. Check
operation of valve. Repair or replace valve as
required.
3. Brake in axle out of adjustment. See section 5 for brake adjustment procedure.
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Skyjack SJ85 AJ Specifications

General

Brand	Skyjack
Model	SJ85 AJ
Category	Boom Lifts
Language	English