Exercise vehicle functions:
Confirm that the three HDC System manual valves V21 (Figure 1, Item 1), V22 (Figure 1, Item 2), and
V23 (Figure 1, Item 3) are in fully OPEN position. Handles must be vertical.
Figure 1. Directional Control Valve (DCV) Bank.
Confirm that vehicle rises up and levels out normally when the engine is started within two minutes.
Confirm that ejector extends and retracts.
Confirm that apron moves up and down.
Confirm that left suspension moves up and down.
Confirm that right suspension moves up and down.
Confirm that the left and right bump stops extend when the vehicle is placed in SPRUNG mode, and
retract when the vehicle is placed in UNSPRUNG mode.
Confirm that winch pays out and pays in.
Valve V23 check:
Manually place valve V23 in the closed position. Handle horizontal (down).
Confirm that the ejector does not extend or retract. (This indicates that valve V23 is working properly.)
Stop engine and ensure that engine is off before connecting HDC control box.