OPERATION IN EXTREME COLD CONTINUED
Hydraulic System Warm-Up
To enable propulsion and loader hydraulic controls after machine start, press park button
to release. With controls enabled, park brake can be reset with park button to set brakes
and disable only propulsion hydraulic control. For controls, refer to WP 0004.
1. Run engine at low idle for two minutes.
2. Increase throttle to high idle.
3. Begin warming up hydraulic oil by holding bucket curl and loader arm lower circuit open. After one minute,
raise arm to full lift and dump and hold circuits open. Repeat several times to warm oil.
4. After 10 minutes, slowly stroke propulsion control. Use caution because ground drive will have a very notice-
able response lag. Continue warm-up for 15 minutes before operating machine under full load.
Maximizing Heat/Defrost Output
1. Open recirculation louvers on bottom of heater box.
2. Turn temperature control knob to low position and blower fan switch to off position.
3. Follow Hydraulic Warm-Up in this work package.
4. After 5 minutes of warm-up, turn temperature control knob to high and place blower fan switch on low until heat
is felt at air louvers.
5. When heat is felt coming out of air louvers, turn blower fan switch to high speed.
6. Continue to run engine at high idle for duration of this test in order to maximize heat output.
1. When moving out, be aware that tires may be frozen to ground.
2. Test brakes and machine controls carefully.
DO NOT run engine at low idle (throttle lever pulled fully back) for long periods. This can
cause a low operating temperature, which can cause acids and deposits in engine oil. Run
engine at full throttle when conditions permit. Failure to follow this caution may result in
damage to equipment.
3. Move ground drive controls slowly to warm hydraulic oil. Cycle each control several times. Normal warm-up
period in extreme cold is 30 minutes with throttle lever moved forward approximately one inch.
4. Operate under a light load for the first 5 minutes of operation.
5. Start driving very slowly for about 100 yd (91.4 m). If a problem is noted, notify Field Maintenance as required.