Case 621D Wheel Loaders Operator's Manual 6-36661NA - PDF DOWNLOAD

Page 140

OPERATING INSTRUCTIONS

After engine warm-up, enable the pilot controls by pushing down on the right hand side of the switch on the instrument control panel. At this time, place the hydraulic lift arm into float and the bucket into roll back to load the engine and heat the hydraulic oil. Continue to heat the hydraulic oil until the 2nd. bar of the hydraulic oil temperature gauge is on. This will yield approximately 20 C (68°F). This may take several minutes. Apply and hold the foot brake, cycle the lift arm and bucket. Repeat the float/roll back heating procedure again until the 2nd. bar of the hydraulic oil temperature is on. Raise the lift arms enough to steer the unit full left and right to war m the oil in the steer ing c y l i n d e r s . I n ex t r e m e c o l d conditions, hold the float/roll back condition for 5 minutes maximum in time rather than to the second bar.

When the machine has been correctly warmed up, apply the foot brake and hold, shift the transmission to forward push the park brake to the Off position and release the foot brake. Operate the mac hi ne i n a c lear s afe a re a. Check the full operation of the machine. DO NOT operate the machine in third or fourth gear until the transmission oil and axle oil have been war med up and the machine moves freely. IMPORTANT: DO NOT operate the machine on the road until the transmission oil and axle oil have been correctly warmed up. Operate the machine in a clear safe area before road operation.

IMPORTANT: Make sure there is clearance around the machine before steering the machine from right to left. In severe cold weather conditions the brakes response can be slow. The use of correct oil in the hydraulic/brake system is required. Even with the correct oil in the hydraulic/brake system the first few times the brakes are actuated there may be some delay before the brakes are applied. The operator must actuate the brake pedal a minimum of 8 to 10 times before the machine is moved.

7. If the machine has been left idling in cold temperature, the engine will stay warm. But the hydraulic/brake oil and the axle oil will not stay warm. The oil and components can become cold and slow brake function response time. If this s h o u l d h a p p e n yo u M U S T g o through the complete machine warm-up procedure. 8. The transmission is equipped with internal protection that does not allow the transmission to engage below -12°C (10°F). If the transmission does not engage below these temperatures, allow 2 to 4 minutes of running in neutral (this time will var y with temperature), then try again.

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6. MACHINE WARM-UP - Once the engine has started, run the engine at half throttle (1 100 to 1 300 RPM) for a minimum of 10 minutes under no load. This will help stabilize the engine.


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