994K Wheel Loader Caterpillar

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Crush Hazard! Stay back a safe distance from the powered stairway when it is being raised or lowered. Failure to stay back may result in injury or death.

The powered stairway is a set of electrohydraulic controlled moveable steps. The powered stairway can be lowered close to the ground level for mounting and dismounting the machine.

Illustration 1	g03499616
Powered stairway and related controls. (1) Control switch (2) Battery disconnect switch (3) Control switch

The powered stairway can be raised or lowered under normal conditions with either one of two different control switches. Control switch (1) for the powered stairway is located on the handrail near the top of the stationary stairway. Control switch (3) for the powered stairway is located in the rear bumper service center.

Battery disconnect switch (2) must be in the ON position for the powered stairway to operate.

Audible and visual warnings will be activated in the operator cab if either one of the following conditions exist when operating the powered stairway:

• The STIC control is not in the NEUTRAL position.

• The parking brake is not engaged.

Anytime the powered stairway is not in the fully raised position, audible and visual warnings will be activated in the operator cab if either one of the following conditions exist:

• The STIC control is not in the NEUTRAL position.

• The parking brake is not engaged.

Lowering

Powered Stairway Lower - In order to lower the powered stairway with either one of the control switches, perform the following steps:

1. Verify that the area around the powered stairway is clear of people and obstacles before lowering the powered stairway.

2. Lift the guard that covers control switch (1) or control switch (3). Hold control switch (1) or control switch (3) in the DOWN position in order to lower the powered stairway. Release the switch in order to stop the powered stairway from moving.

   Note: When either one of the control switches is used to move the powered stairway, an audible alarm near the powered stairway will sound while the powered stairway is in motion.

   Note: When a control switch is used continuously to move the powered stairway, the powered stairway will move from the fully raised position to the fully lowered position in approximately 10 seconds.

3. Always place the powered stairway in the fully lowered position before mounting and dismounting the machine.

Raising

Powered Stairway Raise - In order to raise the powered stairway with either one of the control switches, perform the following steps:

1. Verify that the area around the powered stairway is clear of people and obstacles before raising the powered stairway.

2. Lift the guard that covers control switch (1) or control switch (3). Hold control switch (1) or control switch (3) in the UP position in order to raise the powered stairway. Release the switch in order to stop the powered stairway from moving.

   Note: When either one of the control switches is used to operate the powered stairway, an audible alarm near the powered stairway will sound while the powered stairway is in motion.

3. Always place the powered stairway in the fully raised position before operating the machine.

   Note: If the engine is running and the parking brake is released without the powered stairway in the fully raised position, a warning category 2S will activate. If a warning occurs, take the following action:

   • Safely stop the machine.

   • Apply the parking brake.

   • Investigate the problem.

   Refer to Operation and Maintenance Manual, "Monitoring System" for more information on the conditions that will occur during each warning category.

Locking the Powered Stairway

The powered stairway can be locked in the fully raised position in order to prevent lowering.

Note: Stay clear of the path of movement for the powered stairway while performing this procedure.

1. Move the powered stairway to the fully raised position.
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   Illustration 2	g03504702
   Insertion holes for stairway lock out bolts

2. Locate two insertion holes in the rear bumper for the stairway lock out bolts. The insertion holes are located on the vertical surface of the rear bumper below the pivot point of the powered stairway.
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   Illustration 3	g03504719
   Stairway lock out bolts installed in powered stairway

3. Place a 5P-1076 Hard Washer over each one of two 8T-4194 Hex Head Bolts. Install the bolts with washers into each one of the insertion holes that were located in step 2.

4. Tighten the stairway lock out bolts properly.

Note: Remove the stairway lock out bolts before attempting to lower the powered stairway.