B - Ardiehl.de

DUAL PRESSURE MAIN RELIEF VALVE – 853H
Checking the Low Setting
The tools listed will be needed to do the following
procedure:
MEL10003 – Hydraulic Tester
MEL10006 – Hydraulic Test Kit
Turn the key switch to the OFF position. Before the
engine stops running, turn the key switch all the way to the
left to release the hydraulic pressure at the front auxiliary
quick couplers.
Lift and block the loader. (See Page 1–1.)
Connect the IN port of the hydraulic tester to the female
quick coupler on the loader [A].
Connect the OUT port of the hydraulic tester to the male
quick coupler on the loader [A].
NOTE: Flow will be out from the female coupler on
the loader.
The hydraulic tester must be in the fully open
position before you start the engine. I–2024–0284
When the engine is running during service, the
steering levers must be in neutral and the
parking brake engaged. Failure to do so can
cause injury or death.
W–2006–0284
Start the engine and run at low idle RPM. Push the mode
switch (Item 1) [B] twice (on the instrument panel) to
engage the front auxiliary hydraulics ‘‘detent’’, both lights
(Items 2 & 3) [B] will come ON.
NOTE: High horsepower switch should be in the
OFF position.
Push the button (Item 1) [C] for fluid flow to the quick
couplers.
Watch the flow meter on the hydraulic tester to make sure
the flow is correct. Increase the engine speed to full RPM.
There should be approximately 18.0 GPM (68,1 L/min.)
free flow. Turn the restrictor control, on the tester, until the
main relief valve opens. The correct pressure for the main
relief is 2700–2750 PSI (18617–18961 kPa).
Push the button (Item 1) [C] to disengage the ‘‘detent’’
flow to the front quick couplers.
If the relief pressure is not correct, stop the engine. Adjust
or replace the main relief valve. (See Page 2–25.)
–2–22–
A
B
C
Left
Steering
Lever
Control
2
P–02130
1
Right
Steering
Lever
Control
P–05195
P–00998
P–02129
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
3
1
853, 853H BICS Loader
Service Manual