9
This section describes the removal, inspection, and
installation of the valve block.
1 Clean the valve block and the area around where it
attaches to the motor.
Important: Cleanliness is extremely important; be sure
that no contaminates get into the motor.
2 Position the motor so the valve block is accessible.
7 Remove the two o-rings and back-up rings, and the
square cut seal from between the valve block and motor,
see figure 3.
8 Remove the low pressure relief valve (also called the
charge pressure relief valve).
Note: The low pressure relief valve can be identified by
the notches machined into its large hex head, see figure
4.
9 Mark the high pressure relief valves so they can be
reinstalled in the same ports.
Note: The three digit number stamped on each relief
valve indicates its pressure setting. Multiply this number
by ten to get the actual pressure setting (in PSI).
Examples:
11 Remove the o-rings and back-up rings from the relief
valves. The small o-ring on each high pressure relief
has a back-up ring on each side. The small o-ring on
the low pressure relief valve doesn’t have back-up rings.
12 Inspect the relief valves for damage and replace as
necessary.
Figure 4
Back-up
Rings
Notches
Low Pressure
Relief
High Pressure
Relief
O-ring
10 Remove the high pressure relief valves.
Number
Stamped on
Relief Valve
Multiplier
Relief Valve
Pressure
Setting
500
x10
5000 PSI
016
x10
160 PSI
Figure 3
Sq. Cut Seal
Control
Pressure
Hose
Bolt (4)
Hose Fitting
Valve Block
Back-up Ring
O-ring
3 If the motor gets control pressure from the valve block
disconnect the hose at the valve block and remove the
hose fitting.
4 Loosen the plugs and relief valves that are screwed
into the valve block.
5 Remove the four hex head bolts that hold the valve
block to the motor.
6 Remove the valve block.
O-ring
Minor Repair: Valve Block Inspection
Summary of Contents for 1 Series
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