Barko Hydraulics 495B SD, Service Manual

Page: 36 / 101

Operation and Maintenance Manual Last Updated - 08/31/2016
495B ML TM (S)
36
HYDRAULIC PRESSURE SETTINGS (495ML)
RELIEF VALVES
The Relief Valve portion of the control valves in your Barko Loader limit the flow of hydraulic oil, which relieves
the excess pressure in the hydraulic system, if for any reason pressure is built up above a predetermined, safe,
maximum.
CAUTION
The relief valve pressure setting has been arrived at by our engineers after
considerable experience with and testing of this loader. The setting will provide
maximum safety and efficiency of operation. DO NOT ALTER THIS RELIEF
SETTING! Relief settings increased beyond this setting could be dangerous to life,
limb and property.
The following is a list of pressure settings used on your Barko Loader. Any questions should be directed to the
factory. Phone 715-395-6700.
K170 UPPER VALVE SYSTEM (see also Hydraulic Pressure Adjustments for the K170 Valve):
Pump Compensator (working pressure) ........................................ 3600 PSI (248 Bar)
Main Boom - up (butt end of main boom cylinder)......................... 4000 PSI (276 Bar).......... at the Port Relief.
Main Boom - down (rod end of main boom cylinder) ..................... 1800 PSI (124 Bar).......... at the Port Relief.
Stick Boom - up (butt end of secondary boom cylinder) ................ 4000 PSI (248 Bar).......... at the Port Relief.
Stick Boom - down (rod end of secondary boom cylinder) ............ 4000 PSI (248 Bar).......... at the Port Relief.
Live Heel Boom - up (butt end of live heel boom cylinder) ............ 4000 PSI (248 Bar).......... at the Port Relief.
Live Heel Boom - down (rod end of live heel boom cylinder) ........ 1800 PSI (124 Bar).......... at the Port Relief.
Open/Close - ports A & B............................................................... 2500 PSI (172 Bar).......... at the Feed
Reducers.
Rotate - ports A & B ....................................................................... 1500 PSI (103 Bar).......... at the Feed
Reducers.
Main Relief..................................................................................... 4000 PSI (276 Bar)
Swing System (high pressure reliefs) ............................................ 3600 PSI (248 Bar).......... both right and left.
Servo System (servo relief valve) ...................................................450 PSI (31 Bar)
K170 STEERING/TRAVEL VALVE SYSTEM:
Travel ..............................................................................................450 PSI (31 Bar).............at the Port Relief
Steering ..........................................................................................450 PSI (31 Bar)............at the Feed Reducer
MACHINE FUNCTION SPEEDS
Swing ...................................................... 9 RPM (7 seconds per revolution)
Main Boom ............................................. 9 seconds extend
................................................................ 11 seconds retract
Stick Boom ............................................. 7 seconds extend
................................................................ 9 seconds retract
Grapple Open/Close ............................... 4 seconds close
................................................................ 3 seconds open
Grapple Rotate ....................................... 30 RPM (2 seconds per revolution)
Bar Up & Knives ............................................................................ 1800 PSI (124 Bar)