S T E E R I N G S Y S T E M
TM 5-3805-258-24-1
S Y S T E M S
O P E R A T I O N
SUPPLEMENTAL STEERING
SYSTEM
SUPPLEMENTAL
I. Left neutralizer valve.
6. Pilot section of pump.
2. Hand metering unit
7. Steering section of
(HMU).
pump.
3. Right neutralizer valve.
8. Implement section of
4. Check valve for pilot
pump.
syatam.
9. Steering control valve.
5. Relief valve for pilot
system.
NOTE: The Hand Metering Unit will not give man-
ual steering when the engine is stopped. Steering
with a dead (stopped) engine can be done only when
the Supplemental Steering System is installed.
The supplemental steering system has two
purposes:
(1) To give an oil supply for the steering system if
there is a failure of the primary system or if the
engine stops when the machine is moving.
STEERING SYSTEM
10. Valve spool.
15. Right steering cylinder.
11. Orifice.
16. Flow switch.
12. Left steering cylinder.
17. Diverter valve.
13. Hydraulic tank.
18. Supplemental steering
14. Oil cooler.
pump.
(2) To add oil to the primary oil flow at low engine
rpm when the machine is moving.
NOTE: When the machine moves, the flow of oil
from the supplemental steering pump either; (a)
combines (flows together) with the flow from steer-
ing pump section (7) (at LOWER ENGINE rpm),
or (b) is sent back to hydraulic tank (13) (at HIGH-
ER ENGINE rpm). The supplemental flow starts
to return to the hydraulic tank at 1450 ± 150 rpm.
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