TM 5-3805-280-24-1
Tests
SYSTEM RELIEF AND POWER BOOST
VALVE TEST AND ADJUSTMENT
SPECIFICATIONS
50 5C (120 10F)
Oil Temperature
Engine in Standard Mode Speed
Fast Idle
Work Mode Selector Position
Dig Mode
E Mode Switch Position
Off
HP Mode Switch Position
Off
Auto-Idle Switch Position
Off
System Relief Valve Pressure
34 325 + 1960 - 0 kPa
(343 + 19.6 - 0 bar)
(4980 + 285 - 0 psi)
System Relief Valve Pressure
5295 kPa (53.0 bar) (770 psi)
approximate change per 1/4 turn
of second adjusting plug
Power Boost Pressure
36 285 + 1960 - 980 kPa
(362.9 + 19.6 - 9.8 bar)
(5265 + 285 - 140 psi)
Power Boost Pressure
7110 kPa (71.1 bar) (1030 psi)
approximate change per 1/4 turn
of first adjusting plug
32 mm Nut Torque
78--88 Nm (58--65 lb-ft)
27 mm Nut Torque
59--68 Nm (43--51 lb-ft)
ESSENTIAL TOOLS
9025
TH108328 Adapter (2 used)
25
XPD34BTX (1/8 x 7/16-20 F 37) Male Quick Coupler
66
SERVICE EQUIPMENT AND TOOLS
JT07290 Laptop Computer
JT07274G Excavator Diagnostics Program Disk
JT07273 Cable
JT02156A Digital Pressure and Temperature Analyzer
JT02160 Transducer 70 000 kPa (700 bar) (10 000 psi)
Gauge 70 000 kPa (700 bar) (10 000 psi)
JT05800 Digital Thermometer
6 mm Hex Key Wrench
15, 17, 19, 27 and 32 mm Combination Wrenches
The purpose of the system relief valve is to limit the
maximum pressure in the hydraulic system. The valve is
checked and adjusted to protect components from
damage cause by excessive pressures.
Continued on next page
TX,9025,GG2648 1908JUN981/5
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