TM 5-3805-281-24-1
Tests
SWING MOTOR CROSSOVER RELIEF VALVE TEST AND ADJUSTMENT
SPECIFICATIONS
The purpose of swing crossover relief valves is to limit
50 5C (120 10F)
pressure in the swing circuit, to relieve high pressure
Hydraulic Oil Temperature
spike caused by starting and stopping the swing
Engine Speed
1200 rpm approximate
function and to relieve pressure spikes caused by
Work Mode Selector Position
Dig Mode
external forces when function is in neutral. The valves
E Mode Switch Position
Off
are checked and adjusted to specification to protect
HP Mode Switch Position
Off
components from damage.
Auto-Idle Switch Position
Off
29 910 980 kPa (299.1 9.8
1. Install the temperature probe on the hydraulic
Swing Crossover Relief Valve
bar) (4 340 140 psi)
Pressure
tank-to-pump suction line. (See JT05800 Digital
Thermometer Installation in this group.)
Per 1/4 Turn of Adjusting Plug
2 500 kPa (25 bar) (363 psi)
Approximate Change Pressure
2. Install a tachometer. (See JT05801 Clamp-On
Adjusting Plug-to-Cartridge Nut
186 Nm (137 lb-ft)
Electronic Tachometer Installation in this group.)
ESSENTIAL TOOLS
TH108328 Adapter (2 used)
XPD34BTX (1/8 x 7/16-20 F 37) Male Quick Coupler
SERVICE EQUIPMENT AND TOOLS
JT05800 Digital Thermometer
JT05801 Clamp-On Electronic Tachometer
JT07290 Laptop Computer
JT07274F Excavator Diagnostics Program Disk
9025
JT07273 Cable
25
85
JT02156A Digital Pressure and Temperature Analyzer
JT02160 Transducer 70 000 kPa (700 bar) (10 000 psi)
70 000 kPa (700 bar) (10 000 psi) Gauge
41 mm Combination Wrench
27 mm Combination Wrench
CED,TX08227,3036 1923MAR981/5
3. Connect the laptop computer. (See the installation
procedure in this group.)
a. Start the engine.
b. Select "4 Rear pump delivery pressure" from the
Monitor Data Items.
Continued on next page
CED,TX08227,3036 1923MAR982/5