Section 220-0105
SM 1947 4-00
1
STEERING SYSTEM - Priority Valve
SM - 1954
This allows the valve to modulate flow and pressure
to the steering circuit and body hoist circuit to meet
each circuits flow and pressure requirements.
There are six ports on the priority valve housing as
follows:
Port 'P' - Pump Inlet Port - Supply from pump
Port 'PP' - Pilot Pressure - Plugged
Port 'CF' - Control Flow - Supply to steering valve
Port 'EF' - Excess Flow - Supply to body hoist valve
Port 'LS' - Load Sensing - To LS port on steering
valve
Port 'T' - Relief Return - Return to tank
DESCRIPTION
The priority valve can be identified as item 5 in
Section 220-0000, STEERING SYSTEM
SCHEMATIC.
The priority valve is mounted off the right hand fender
support bracket. The valve is installed in the lines
between the main hydraulic pump, steering valve and
body control valve. Hydraulic oil is pumped to the
priority valve and depending on the position of the
spool within the priority valve, oil is directed to the
steering or body hoist systems.
The spool in the priority valve has 2 metering edges.
Fig. 1 - Sectional View of Priority Valve
9 - Damping Orifice
10 - Case
11 - 'O' Ring
12 - Damping Orifice
5 - Washer
6 - Plug
7 - 'O' Ring
8 - Damping Orifice
1 - Valve Body
2 - Spool
3 - Spring
4 - Relief Valve
1
7
6
8
2
5
11
4
10
3
9
12
CF
PP
T
P
EF
LS
METERING EDGE
Содержание TA30
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