Usage:
All Articulated Dump Trucks With Hydraulic (Hydroflex) Rear Suspension
Description of Change: The rear suspension hydraulic system of the subject machines is a closed circuit and an accumulation of debris in the hydraulic oil can cause premature wear of suspension cylinder components.
To overcome this problem a servicing procedure has been introduced on "D" series trucks which involves flushing out the circuit and filling it with fresh oil. This procedure should be carried out every 250 service hours or monthly.
Adaptable To: This new procedure should be applied to all articulated dump trucks equipped with hydraulic (HYDROFLEX) rear suspension.
General Procedure
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Rear suspension lines contain fluid at high pressure. Personal injury can result from improper servicing. Lower suspension fully before working on hydraulic lines. Suspension system may drop machine suddenly leaving no clearance between the axle housing, main frame, tires, and mud guards. Working in these areas can result in personal injury or death by crushing. Stay clear until the engine is stopped and the suspension has been fully lowered. |
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1. With the machine parked on level ground, block the wheels and disengage the parking brake.
2. Attach hoses to the suspension purge valves on either side of the trailer and put the free ends into suitable containers.
3. Open the purge valves and allow the suspension to fully lower.
4. Close the purge valves.
5. Set the rear suspension to the correct height as described in the appropriate Service Manual and Operation and/or Maintenance Manual.
6. Engage the parking brake and remove the wheel blocks.
Check the hydraulic tank oil level.
Make reference to this procedure in your Operation and/or Maintenance Manual and include it in any routine servicing systems you may be using for your equipment.