12
11 Reposition the motor so the shaft is vertical and the
valve block is on top. Stand the motor on two blocks of
wood as shown in figure 10.
12 If the motor gets control pressure from the valve
block remove the control pressure hose and fittings.
13 Loosen the plugs and relief valves that are screwed
into the valve block.
14 Remove the four hex head bolts that hold the valve
block to the motor.
15 Remove the valve block.
16 Remove the two o-rings and back-up rings, and the
square cut seal from between the valve block and motor,
see figure 10.
17 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
11.
18 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:
20 Remove the o-rings and back-up rings from the relief
valves. The small o-ring on each high pressure relief
valve has a back-up ring on each side. The small o-ring
on the low pressure relief valve doesn’t have back-up
rings.
21 Inspect the relief valves for damage and replace as
necessary.
O-ring
High Pressure
Relief
Low Pressure
Relief
O-ring
Back-up
Rings
Notches
Figure 11
19 Remove the high pressure relief valves.
Number
Stamped on
Relief Valve
Multiplier
Relief Valve
Pressure
Setting
500
x10
5000 PSI
016
x10
160 PSI
Control
Pressure
Hose
Hose Fitting
Bolt (4)
Valve Block
Sq. Cut Seal
Back-up Ring
O-ring
Figure 10
Major Repairs: Valve Block
Summary of Contents for 1 Series
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