148
SJ82 T, SJ86 T
229040ABA
Section 4 – Troubleshooting Information
Hydraulic System
4.3 Hydraulic System
4.3-1 All Controls Inoperative
1.
Broken or defective drive pump shaft or coupling.
Check pump shaft and coupling. Replace if defec-
tive.
2.
Hydraulic oil level low.
Check oil level. Fill to proper level.
4.3-2 All Boom Functions Inoperative
1.
Open or defective dump/ enable valve 2H-21A.
Clean valve. Check O-rings on valve. Check opera-
tion of valve. Repair or replace valve as required.
2.
Stuck or defective relief valve RV1.
Set valve to specifications. Check O-rings and
clean valve. Repair or replace valve as required.
3.
System pump P2 out of adjustment or is
defective.
Refer to section 5 for pump set up procedure. Re-
place if defective.
4.
Defective load sense adjusting valve 3H-V2.
Check valve. Replace if defective.
5.
Defective pressure compensator valve 3H-V1.
Check valve. Replace if defective.
6.
Plugged or defective high pressure filter F1.
Check filter. Replace if plugged or defective.
4.3-3 No Main Boom Up
1.
Stuck or defective differential sensing valve
DSV2.
Clean valve. Check O-rings on valve. Check opera-
tion of valve. Repair or replace valve as required.
2.
Stuck or defective lift up valve 4H-14.
Clean valve. Check operation of valve. Repair or
replace valve as required.
3.
Stuck or defective shuttle valve SV2.
Clean valve. Check O-rings on valve. Check opera-
tion of valve. Repair or replace valve as required.
4.
Stuck or defective check valve CV5.
Clean valve. Check O-rings on valve. Check opera-
tion of valve. Repair or replace valve as required.
5.
Stuck or defective counterbalance valve CB3.
Clean valve. Check O-rings on valve. Repair or
replace valve as required.
6.
Defective lift cylinder C1.
Check seals on cylinder. Replace as necessary.
Replace cylinder if defective.
4.3-4 No Main Boom Down
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