Case 721D Wheel Loader Operators Manual 6-35120 - PDF DOWNLOAD

Page 137

OPERATING INSTRUCTIONS 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 warm t h e hy d r a u l i c o i l a n d t h e transmission oil.

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.

The hydraulic steering can become s l o w i n s ev e r e c o l d w e a t h e r conditions. Cycle the steering from full right to left a minimum of 3 to 5 times before you dr ive the machine. NOTE: 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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After engine warm-up, enable the pilot controls by pushing down on the right hand side of the switch on the instrument control panel. Apply and hold the foot brake, and cycle all hydraulic functions several times. In severe cold weather conditions, the hydraulic functions may be slow to respond. Cycling all the hydraulic system functions s ev e r a l t i m e s w i l l w a r m t h e hydraulic oil and the hydraulic system components.

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.


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