TM 5-3805-281-24-1
Tests
PUMP CONTROL VALVE TEST
SPECIFICATIONS
The function of pump control valves is to send a
50 5C (120 10F)
regulated pilot oil control signal to its respective pump
Hydraulic Oil Temperature
regulator to change pump flow in response to the
Engine Speed
Slow Idle and Fast Idle
actuation of control valve spools. (See Pump Control
Work Mode Selector Position
Dig Mode
Valve Operation in Group 9025-05.) The purpose of
E Mode Switch Position
Off
test is to check that the regulated pilot oil control
HP Mode Switch Position
Off
signals increases as a function is actuated and
Auto-Idle Switch Position
Off
decreases when function is returned to neutral by
monitoring the front and rear pump control pressure
Typical Front or Rear Pump
980--1569 kPa (9.8--15.7 bar)
Control Valve Pilot Oil Control
(142--228 psi) from slow idle to
sensor readings. The valves are adjusted at the factory
Signal Pressure
fast idle with all functions in
and there should never be any need for an adjustment
neutral
in the field.
Typical Front or Rear Pump
2 942--3 923 kPa (29.4--39.2
Control Valve Pilot Oil Control
bar) (427--569 psi) at fast idle
1. Install the temperature probe on the hydraulic
Signal Pressure
with raised track at full speed
tank-to-pump suction line. (See JT05800 Digital
Thermometer Installation in this group.)
ESSENTIAL TOOLS
JT03001 (7/16-20 M 37 x 7/16-20 F 37 Sw x 7/16-20 M 37)
(Parker No. 063T--4--4) (2 used) Tee
XPD34BTX (1/8 x 7/16-20 F 37) Male Quick Coupler
SERVICE EQUIPMENT AND TOOLS
JT05800 Digital Thermometer
JT07290 Laptop Computer
JT07274F Excavator Diagnostics Program Disk
9025
JT07273 Cable
25
98
JT02156A Digital Pressure and Temperature Analyzer
JT02162 Transducer 35 000 kPa (350 bar) (5 000 psi)
Gauge 7 000 kPa (70 bar) (1 000 psi)
32 mm Combination Wrench
19 mm Combination Wrench
CED,TX08227,3139
1927MAY981/4
2. Connect the laptop computer. (See the installation
procedure in this group.)
a. Start the engine.
b. Select "1 Front pump control pressure" and "6 Rear
pump control pressure" from the Monitor Data
Items.
Continued on next page
CED,TX08227,3139
1927MAY982/4