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Hydraulic System
4.3 Hydraulic System
4.3-1 All Hydraulic Controls Inoperative (No Lift or Steer functions)
1. Pump motor not engaged
2. Pump motor coupler defective
3. Defective pump P1
4. System relief valve RV1 set too low or stuck
open.
4.3-2 No Lift Function
1. Check valve CV1 stuck closed
2. Stuck or defective lift valve 3H-14
3. Defective lift Cylinder assembly
4. Stuck or defective RV1
4.3-3 No Lower Function
1. Stuck or defective lift valve 3H-14
2. Stuck or defective lower valve 2H-13
3. Blocked lower orifice OR1
4. Defective lift Cylinder assembly
4.3-4 No Steer Left and/or Right
1. Stuck or defective steer valve 4H-23/4h-24
2. Steer crossover relief valve RV2 set too low or
stuck open.
3. Steer cylinder C5 bypassing, or mechanically
binding
4. Stuck or defective RV1
SJ12 E, SJ16 E, SJ20 E
Section 4 – Troubleshooting Information
Refer to Electrical troubleshooting. Replace pump
motor if defective.
Check coupler. Replace if defective
Check pump output. Replace if defective.
Check and adjust valve setting. Replace if
defective.
Clean valve. Check O-rings on valve. Check
operation of valve. Repair or replace valve as
required.
Clean valve. Check O-rings on valve. Check
operation of valve. Repair or replace valve as
required.
Check cylinders. Repair or replace as required.
Adjust or replace if defective.
Clean valve. Check O-rings on valve. Check
operation of valve. Repair or replace valve as
required.
Clean valve. Check O-rings on valve. Check
operation of valve. Repair or replace valve as
required.
Check orifice. Clean or replace as required
Check cylinders. Repair or replace as required.
Clean valve. Check O-rings on valve. Check
operation of valve. Repair or replace valve as
required.
Check and adjust valve setting. Replace if
defective.
Check cylinder and all steer linkage. Repair or
replace defective componants as required.
Adjust or replace if defective.
241914ACA
69
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Table of Contents
Troubleshooting
