Check Orifice For Clogging

CHECK ORIFICE FOR CLOGGING


Work Procedure


CAUTION:
- Clean surrounding areas of oil injection jack using steam before starting operation, since there may be mud on it.
- Clean oil pressure gauge (special service tool: KV40108000) jack with steam before use.
1. Remove protector of PPMU.
2. Remove cap of oil injection jack.





3. Install an oil pressure gauge (SST: KV40108000) (A) to oil injection jack.

CAUTION:
- Jack must be securely inserted until a click sound can be heard.
- Pressure reducing valve (B) of the oil pressure gauge must be closed.





4. Loosen needle valves A, C, and E of PPMU by approximately 2 rotations.

CAUTION:
Never loosen the needle valve more than required.
5. Lift up the vehicle.

CAUTION:
Check that tires never contact the ground.
6. Tighten needle valves A, C, and E of PPMU.
7. Lift down the vehicle.

CAUTION:
Check that the lift is fully lowered.





8. Loosen pressure reducing valve (A) of oil pressure gauge and then lower pressure.

CAUTION:
Be careful since oil drains swiftly from oil drain hole (B).
9. Check that reading of oil pressure gauge is 0 MPa. Close pressure reducing valve.
10. Loosen needle valve E of PPMU by approximately 2 rotations.

CAUTION:
Never loosen the needle valve more than required.
11. Write down a value of the oil pressure gauge.
12. Tighten needle valve E of PPMU.
13. Loosen pressure reducing valve of oil pressure gauge and then lower pressure.

CAUTION:
Be careful since oil drains swiftly from oil drain hole.
14. Check that reading of oil pressure gauge is 0 MPa. Close pressure reducing valve.
15. Loosen needle valve A of PPMU by approximately 2 rotations.

CAUTION:
Never loosen the needle valve more than required.
16. Read a value of the oil pressure gauge after 5 minutes.
17. Compare difference of reading with pressure reading in step 11.

Pressure difference
0.2 MPa or more : Replace the PPMU. Refer to SCS-39, "PPMU, MIDDLE TUBE ASSEMBLY, PPMU PIPE : Removal and Installation". Removal And Installation
0.2 MPa or less : Normal

18. Tighten needle valve A of PPMU.
19. Loosen pressure reducing valve of oil pressure gauge and then lower pressure.

CAUTION:
Be careful since oil drains swiftly from oil drain hole.
20. Check that reading of oil pressure gauge is 0 MPa. Close pressure reducing valve.
21. Loosen needle valve C of PPMU by approximately 2 rotations.

CAUTION:
Never loosen the needle valve more than required.
22. Read a value of the oil pressure gauge after 5 minutes.
23. Compare difference of reading with pressure reading in step 11.


Pressure difference
0.2 MPa or more : Replace the PPMU. Refer to "PPMU, MIDDLE TUBE ASSEMBLY, PPMU PIPE : Removal and Installation". Removal And Installation
0.2 MPa or less : Normal

24. Tighten needle valve C of PPMU.
25. Loosen pressure reducing valve of oil pressure gauge and then lower pressure.

CAUTION:
Be careful since oil drains swiftly from oil drain hole.
26. Check that reading of oil pressure gauge is 0 MPa.
27. Remove oil pressure gauge.
28. Tighten needle valves A, C, and E of PPMU to the specified torque.

Tightening torque: 8.3 N-m (0.85 kg-m, 73 in-lb)