Throttle valve B pressure test

6. Using assistance, hold throttle control drum fully closed.
7. Run engine at 1000 rev/min and observe pressure recorded on gauge: Pressure = 0 to 0.15 bar
8. If pressure is too high, throttle valve A is faulty.
9. Disconnect 0 to 7.0 bar gauge and connect 0 to 20 bar gauge to inspection plug hole.
10. Select ’D3’ or ’D4’.
11. Using assistance, hold throttle control drum fully open.
12. Run engine at 1000 rev/min and observe pressure recorded on gauge: Standard = 4.7 to 4.8 bar Service limit = 4.6 bar
13. If pressure is too low, throttle valve A or modulator valve is faulty.
14. On completion of test, disconnect gauge.
15. Fit a new sealing washer to inspection plug, fit and tighten plug to 18 Nm.

NOTE: Do not connect cable to throttle control drum at this stage

16. Carry out throttle valve B pressure test

Throttle valve B pressure test

1. Remove throttle valve B inspection plug, discard sealing washer.
2. Connect gauge (0 to 7 bar) of gauge set 18G 1554 to inspection hole.
3. Select ’D3’ or ’D4’, release handbrake and allow wheels to rotate freely.
4. Using assistance, hold throttle control drum fully closed.
5. Run engine at 1000 rev/min and observe pressure recorded on gauge: Pressure = 0 to 0.15 bar
6. If pressure is too high, throttle valve B is faulty.

NOTE: Proceed with remainder of test to confirm diagnosis