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DUAL PRESSURE MAIN RELIEF VALVE – 853H
(Cont’d)
853, 853H BICS Service Manual #6724012 – Hydraulic System Section Part 1 of 3
Adjusting the Low Setting
NOTE: Adjust the low pressure setting before
adjusting the high pressure setting.
Correct pressure for the low setting is 2700–2750 PSI
(18617–18961 kPa). (See Page 2–22) for the correct
procedure to check the setting.
To adjust the low pressure setting on the main relief valve,
(Item 1) [A] disconnect the pilot hose (Item 2) [A] from the
adapter fitting (Item 3) [A].
Remove the adapter fitting (Item 3) [A].
Remove the high pressure adjustment housing (Item 1)
[B] from the main relief valve.
Use a 1/4’’ allen wrench (Item 1) [C] to turn the adjusting
screw (Item 2) [C] in to increase pressure or out to
decrease pressure.
One turn is equal to approximately 490 PSI (3379 kPa).
Reinstall the high pressure adjustment housing and
adapter.
Reconnect the pilot hose.
Start the engine and increase the engine speed to full
RPM. Check for the correct pressure setting.
Repeat the procedure until the pressure setting is
approximately 2700–2750 PSI (18617–18961 kPa).
When the correct pressure setting is reached, the next
step is to set the high pressure adjustment on the main
relief valve (See Page 2–23 for the correct procedure).
Stop the engine.
A
B
C
2 1
3
1
Select Valve
(GEM Block)
Control Valve
2
1
E–02232
MC–01654
MC–01654
853, 853H BICS Loader
–2–25– Service Manual