D250E Series II and D300E Series II Articulated Trucks Caterpillar

In-Line Refrigerant Dryer - Check and Replace

Usage:

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Personal injury can result from contact with refrigerant.
Contact with refrigerant can cause frost bite. Keep face and hands away to help prevent injury.
Protective goggles must always be worn when refrigerant lines are opened, even if the gauges indicate the system is empty of refrigerant.
Always use precaution when a fitting is removed. Slowly loosen the fitting. If the system is still under pressure, release it slowly in a well ventilated area.
Personal injury or death can result from inhaling refrigerant through a lit cigarette.
Inhaling air conditioner refrigerant gas through a lit cigarette or other smoking method or inhaling fumes released from a flame contacting air conditioner refrigerant gas, can cause bodily harm or death.
Do not smoke when servicing air conditioners or wherever refrigerant gas may be present.

Use a certified recovery and recycling cart to properly remove the refrigerant from the air conditioning system.

Park the machine on a level surface. Ensure that the parking brake is fully engaged. Lower the dump body and stop the engine.

The in-line refrigerant dryer is located underneath the floor of the cab on the right side of the machine.

The early type of in-line refrigerant dryer has a moisture indicator.

Check

Raise the cab in order to gain access to the in-line refrigerant dryer.
Refer to the Operation and Maintenance Manual, "Cab Tilt".

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Illustration 1	g00387392

Check moisture indicator (2) on the in-line refrigerant dryer. If the moisture indicator is pink, replace the in-line refrigerant dryer. The moisture indicator should always be checked at the end of the summer.
Use the following procedure in order to replace the in-line refrigerant dryer.

Replacement

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Illustration 2	g00606435

Allow the air conditioning system to remain inactive for five minutes in order to equalize the pressure.

Remove bolt (4), the washer and clip (5) in order to lower the used in-line refrigerant dryer.

Disconnect the "IN" hose (1) from the used in-line refrigerant dryer. Disconnect the hose at the quick coupler.

Connect the "IN" hose (1) that was disconnected in Step 3 to the "IN" hose coupler on the new in-line refrigerant dryer.

Start the engine and operate the air conditioning system for one minute in order to evacuate the refrigerant from the used in-line refrigerant dryer.

With the air conditioning system in operation, disconnect the "OUT" hose (3) from the used in-line refrigerant dryer. Disconnect the hose at the quick coupler.