Barko Hydraulics 495B SD, Service Manual

Page: 40 / 101

Operation and Maintenance Manual Last Updated - 08/31/2016
495B ML TM (S)
40
HYDRAULIC PRESSURE ADJUSTMENT CONTINUED...
Pilot
Filter
K170 UPPER VALVE ADJUSTMENTS
NOTE: The Pilot Filter must be removed and cleaned every 1000 hours.
Main Relief - 4000 PSI non-adjustable.
Pilot Relief - 450 PSI non-adjustable.
Port Reliefs for all boom and swing functions are non-adjustable.
Grapple functions are equipped with adjustable feed reducers.
Pressures to the grapple open and close functions should not exceed 2200 PSI.
Pressures to grapple rotate functions should not exceed 1500 PSI.
To adjust, install a gauge on the load sense test port located on the pump (see Pump Adjustments for location
of test port). Remove the acorn nut and loosen the jam nut (13 mm wrench). Using a 4 mm Allen wrench,
turn the adjustment screw out (counterclockwise) to lower the pressure or in (clockwise) to raise pressure.
Pilot Relief
(pressure reducing valve)
Pilot
Supply
Port
Load
Sense
Pressure
Port
(PL)
Pump
Pressure
Gauge Port
(PX)
K170 UPPER VALVE BANK
Counter
Pressure
Valve
Port Reliefs
(non-adjustable)
Feed
Reducers
(adjustable)
Outlet Cover
(with pressure in)
Counter
Pressure
Valve
Feed
Reducers
(adjustable)
Rotate
Stick Swing O/C
Main
Inlet Cover
Port Reliefs
(non-adjustable)
Main Relief
(non-adjustable)
Main Relief
(non-adjustable)
A
B
A
B
A
B
A
B
A
B
A
B
A
B
Active Fill
Valve