TM 5-3805-281-24-1
Tests
PILOT PRESSURE REGULATING VALVE TEST AND ADJUSTMENT
SPECIFICATIONS
Purpose of test is to ensure there is enough pilot
50 5C (120 10F)
pressure to operate all the pilot system functions and
Hydraulic Oil Temperature
to adjust the pressure as necessary. The pilot pressure
Engine Speed
Slow and Fast Idle
regulating valve is used to regulate the pilot system
Work Mode Selector Position
Dig Mode
pressure.
E Mode Switch Position
Off
HP Mode Switch Position
Off
NOTE: The laptop computer with the excavator
Auto-Idle Switch Position
Off
diagnostics program can be used to make a
3 925 980 kPa (39.2 9.8
quick check of the pilot system pressure using
Pilot Pressure Regulating Valve
bar) (570 140 psi)
at Slow Idle Pressure
the arm in function. Connect the computer and
4 410 980 kPa (44.1 9.8
select "5 Arm roll-in pilot pressure" from
Pilot Pressure Regulating Valve
bar) (640 140 psi)
at Fast Idle Pressure
monitor data items. Actuate the arm in function
over relief. Check the pressure at slow idle
Per 0.25 mm (0.010 in.) Shim
78 kPa (0.75 bar) (11 psi)
Approximate Change Pressure
and at fast idle. The pressure reading
displayed is from the arm in pressure sensor
Per 0.5 mm (0.020 in.) Shim
157 kPa (1.57 bar) (23 psi)
Approximate Change Pressure
located in the flow regulator valve.
Per 1.0 mm (0.040 in.) Shim
304 kPa (3.04 bar) (44 psi)
Approximate Change Pressure
Before making any adjustments, check the
pilot pressure at the pilot pump using a
Plug to Pilot Pressure
25 Nm (215 lb-in.)
Regulating Valve Housing
pressure gauge.
1. Stop the engine.
ESSENTIAL TOOLS
202862 (3/4-16 M 37 x 3/4-16 F 37 Sw x 7/16-20 M 37) Tee
TH108328 Adapter
9025
XPD34BTX (1/8 x 7/16-20 F 37) Male Quick Coupler
25
66
SERVICE EQUIPMENT AND TOOLS
JT02156A Digital Pressure and Temperature Analyzer
JT02161 Transducer 35 000 kPa (350 bar) (5 000 psi)
Gauge 7 000 kPa (70 bar) (1 000 psi)
JT05800 Digital Thermometer
Continued on next page
CED,TX08227,3032
1918MAR981/4
