Table of Contents
Advertisement
5. Remove vacuum on the hydraulic tank. Start the
engine. Allow the accumulator to fill up. Mea-
sure leakage from the return hose fitting on the
bleeddown manifold. Maximum allowable leak-
age from the bleeddown manifold is 541 ml
3
(33.0 in.
) per minute. If leakage is excessive,
the following components should be replaced
until the leakage is within the allowable limits:
• Bleeddown Solenoid
• System Relief Valve 27579 kPa (4000 psi)
• Piloted Check Valve
6. After test is complete, stop the engine with the
shut down switch on the console next to the
seat. Do not use the key switch to stop the
engine.
L10-8
If key switch is used, all the oil in the accumula-
tor will come out the return port that was used to
check manifold leakage.
FIGURE 10-4. BLEEDDOWN MANIFOLD
Hydraulic Check-out Procedure
7. Before removing plugs on bleeddown manifold
or connecting lines that have been discon-
nected, be sure to draw a vacuum on the
hydraulic tank to prevent spillage. Reconnect all
hoses to their proper location.
8. Turn the key switch to the OFF position to allow
steering accumulators to bleed down. Remove
test equipment.
1. Bleeddown Solenoid
2. Quick Disconnect, Brake System
3. To Steering Accumulators
4. Low Steering Pressure Switch
5. Relief Valve - 3447 kPa (500 psi)
6. Flow Amplifier
7. Feedback Pressure to Unloader Valve
8. Check Valve
9. Relief Valve - 27,579 kPa (4000 psi)
10. Bleeddown Manifold Valve Assembly
11. Tank Return Line
12. Supply (From Filter)
13. Check Valve (Piloted)
14. Supply to Flow Amplifier
15. Hoist Pilot Valve Return to Tank
16. Brake System Supply
17. Return From Flow Amplifier
L10028
Advertisement
Chapters
Table of Contents
