TM 5-3810-307-24-1-1
EMERGENCY (STANDBY) STEERING VALVE AND PUMP
DESCRIPTION
The steering system incorporates a ground driven
valve which normally returns the oil to the hydraulic
emergency (standby) steering pump which is
reservoir. The standby valve is spooled so that in
mounted on the rear of the transmission. As long as
the event of an engine failure or main steering pump
the transmission is turning (crane moving), the
failure, the hydraulic oil flow produced by the
emergency steering pump will pump hydraulic oil.
emergency steering pump is directed to the front
The hydraulic flow is controlled by the standby
axle steering circuit which will allow the operator to
safely steer the crane while the crane is moving.
MAINTENANCE
EMERGENCY (STANDBY) STEERING VALVE AND PUMP
Removal
a.
Ensure battery disconnect switch is in OFF position.
b.
Remove emergency (standby) steering valve as follows:
(1)
Tag and disconnect electrical leads from emergency steering valve (4, Figure 2-5-8).
(2)
Place a suitable drain pan under emergency steering valve (4) to catch residual oil.
(3)
Tag and disconnect hydraulic lines from fittings on emergency steering valve (4). Cover open ends
of lines and fittings.
(4)
Remove capscrews (1), washers (2), lockwashers (3), and nuts (5) securing emergency steering
valve (4).
(5)
If necessary, remove elbows (6, 8, and 10) and o-rings (7, 9, and 11) from connectors (12, 13, and
14).
(6)
If necessary, remove connectors (12, 13, 14, and 15), washers (16, 18, and 19), crush washer (17),
and o-rings (20, 21, and 22) from emergency steering valve (4).
c.
Remove emergency (ground driven) steering pump as follows:
(1)
Drain oil from hydraulic tank and place suitable drain pan under emergency steering pump (29,
(2)
Remove capscrews (23), flange halves (24), hydraulic hose (25), and o-ring (26) from emergency
steering pump (29).
(3)
Tag and disconnect remaining hydraulic hoses from elbows (38 and 40) and adapter (39). Cover
open ends of lines and fittings.
(4)
Remove capscrews (27), washers (28), pump (29), and gasket (30) from spacer (32).
(5)
Remove splined adapter (41) from shaft of pump (29) or transmission if it did not come out with
pump.
