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Hydraulic System
Forward Drive
1. Defective pump displacement control 4H-16.
2. Defective or misadjusted drive relief valve RV6.
Reverse Drive
1. Defective pump displacement control 4H-15.
2. Defective or misadjusted drive relief valve RV7.
4.3-15 Differential Lock will not Engage
1. Stuck or defective differential lock valve 3H-165.
2. Bypassing or defective differential lock cylinder
C10.
4.3-16 No High Speed Drive
1. Stuck or defective 2 speed valve 3H-45.
2. Defective shift spool in drive motor M1.
4.3-17 No Steer
Steer Right
1. Stuck or defective right steer valve 4H-23(A).
2. Stuck or defective dual check valve DCV2.
3. Stuck or defective check valve CV2.
4. Plugged orifice OR1.
5. Defective steer cylinder C8 for 4WD or C9 for
2WD.
SJ40 T+, SJ45 T+
Section 4 – Troubleshooting Information
Check control. Replace if defective.
See section 5 for drive pump set up procedures.
Check control. Replace if defective.
See section 5 for drive pump set up procedures.
Clean valve. Check O-rings on valve. Check
operation of valve. Repair or replace valve as
required.
Check seals on cylinder. Replace as necessary.
Replace cylinder if defective
Clean valve. Check O-rings on valve. Check
operation of valve. Repair or replace valve as
required.
Check motor. Repair or replace if necessary.
Clean 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.
Clean valve. Check O-rings on valve. Check
operation of valve. Repair or replace valve as
required.
Check orifice. Clean if plugged or replace if
defective.
Check seals on cylinder. Replace as necessary.
Replace cylinder if defective.
238273AAA
113
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