374F Excavator Machine Systems Hydraulic System Warm-Up Caterpillar

Introduction

Use the following procedure to warm the hydraulic oil to 55° ± 5°C (131° ± 9°F).

Refer to the Operation and Maintenance Manual, "Engine and Machine Warm-up" for more information on starting a cold machine.

Warm-up Procedure

1. Start the engine.
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   Illustration 1	g03689765
   (1) "Machine Attachments" (2) "Auto Hyd Warm Up Temp" (3) Home Key

2. Use the monitor to change the auto warm-up target temperature to 55° C (131° F).

   1. Enter the "Service" menu.

   2. Enter password "9992".

   3. Select "Configurations".

   4. Select "Machine Attachments".

   5. Select "Auto Hyd Warm Up Temp".

   6. Enter 55° C (131° F).

3. Press the Home Key (3) on the monitor.

4. Position the implements on the ground.

5. Place the hydraulic activation lever in the LOCKED position.
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   Illustration 2	g03689767
   (4) Start Auto Warming Up? (5) Auto warm-up key

6. Press the auto warm-up key (5) on the monitor.

   Note: A message will appear on the monitor to place the implements on the ground.

7. Press the auto warm-up key (5) again in order to start the auto warm-up function.
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   Illustration 3	g03689770
   (6) Auto Warming Up Starting

   Note: A "Auto Warming Up Starting" message will appear on the monitor when the automatic warm-up function is active.

   Note: The automatic warm-up will stop once the hydraulic oil temperature has reached 55° C (131° F) or when the hydraulic activation lever is moved to the UNLOCKED position.

8. Reset the auto hydraulic warm-up temperature back to the original setting.