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SELECT VALVE (G.E.M. Block) 853H
Checking the Main Relief Valve
The tools listed will be needed to do the following
procedure:
MEL10003 – Hydraulic Tester
MEL10006 – Hydraulic Test Kit
Lift and block the loader (Page 1–1).
Connect the IN port of the hydraulic tester to the female
quick couplers (Item 1) [A] on the loader.
Connect the OUT port of the hydraulic tester to the male
quick coupler (Item 2) [A] on the loader.
The hydraulic tester must be in the fully open
position before you start the engine. I–2024–0284
Put jackstands under the front axles and rear
corners of the frame before running the engine
for service. Failure to use jackstands can allow
the machine to fall or move and cause injury or
death.
W–2017–0286
Start the engine and run at low idle RPM. Push the mode
switch (Item 1) [B] once (on the instrument panel) to
engage the front auxiliary hydraulics momentary, the light
(Item 2) [B] will come ON.
Push the rocker switch (Item 3) [B] for fluid pressure to
the secondary quick couplers.
Watch the flow meter on the hydraulic tester to make sure
the flow is correct. Increase the engine speed to full RPM.
The free flow should be approximately 8.0 GPM (30,3
L/min.). Turn the restrictor control, on the tester, until the
main relief valve opens. The correct pressure for the main
relief is approximately 3000 PSI (20685 kPa).
Release the rocker switch (Item 3) [B] to disengage the
flow to the secondary quick couplers.
If the relief pressure is not correct, stop the engine. Adjust
or replace the main relief valve in the select valve (Item
1) [C]. The select valve (G.E.M. Block) is located at the
left side under the control panel.
Remove the cap from the relief valve (Item 1) [D] and turn
the adjusting screw in or out until the correct pressure is
reached.
A
B
C
D
1
3
Left
Steering
Lever
Control
P–02130
1
2
1
P–04761
P–00998
P–05201
P–05200
853, 853H BICS Loader
–2–27– Service Manual
2
1