IDLER AS 2774492 - Caterpillar

Relief Valve Adjustment
Relief Valve Adjustment Procedures
Preparation
Pump Compartment (Typical)
(H) Tap (upper pump delivery pressure). (J) Tap (power shift pressure).1. Position the machine on level ground and stop the engine.2. Release the pressure in the hydraulic system. See the section "Release Of Pressure In The Hydraulic System" in this module.3. Connect a 60 000 kPa (8700 psi) pressure gauge to the main pump tap (H).4. Connect a 4000 kPa (580 psi) pressure gauge to tap (J).5. Start the engine and move the stick IN and OUT to its full travel position. Do this operation several times until the hydraulic oil temperature reaches 55 5°C (131 9°F).6. Place the power mode selector switch (E) in Power Mode position (indicator ON).7. Place the engine speed dial (F) at position "10" on display (G). Check that engine speed under no load is at 2050 50 rpm with AEC switch (1a) in the OFF position. (Read rpm 3 seconds after the speed dial switch has been placed in position "10".) See the section, "Operational Test Preparations" in the "Testing and Adjusting Manual" for the specified engine rpm for dial position "10". Normal operations (see characteristic curve) of the engine and pumps are necessary for the pressure adjustment. If the results of the pressure adjustment are not correct, then the engine and pump characteristic curve needs to be checked. If the pump flow is lower than the specification make sure there is no air in the hydraulic system. Refer to the section in this module "Removal Of Air From The Hydraulic System".Temporary Setting Of The Main Relief Valve Pressure
The purpose for "Temporary Setting Of The Main Relief Pressure" is done so implement line relief valves and travel relief valves can be adjusted while adequate pressure is supplied.
Top Of Main Control Valves (typical)
(22) Main relief valve. (23) Locknut. (24) Adjuster.1. Slowly move the attachment control lever to fully retract the tool (bucket) cylinder rod.2. Check to be sure the main relief valve pressure setting is 34 350 500 kPa (4975 72 psi). Always make final pressure adjustments on pressure rise.3. Loosen locknut (23) and turn adjuster (24) clockwise one half turn. Tighten locknut (23).Adjustment Of Two Way Circuit Line Relief Valve Pressure
Preparation
1. Start the service program "Service Mode" and keep the power shift pressure constant at 2350 kPa (340 psi). Read the pressure gauge attached at tap (H) to monitor the power shift pressure.2. Select high mode two way operation. Place combined circuit ball valve lever (6) in CLOSED position and hydraulic attachment control switch (5) in the "rabbit" position. For further information of "Service Mode", reference "Engine And Pump Electronic Control System Service Manual" SENR9291.Adjustment
Main Control Valve Compartment (Typical)
(13) Line relief valve (attachment circuit). (14) Flow check valve.
Line Relief Valve (If equipped)
(23) Locknut. (24) Adjuster. (25) Cap.
Line Relief Valve (If Equipped)
(23) Locknut. (26) Cap (Adjuster). During line relief adjustment, do not turn the engine OFF. This prevents a change in power shift pressure. Always make final pressure adjustment when gauge