Doosan Compressor NHP1500

Compressor Oil Filter Element replaced?

Wheels (bearings, seals, etc) checked?

Fuel Tank (fill at end of day) drained?

Sign off on the compressor maintenance

WARNING: Do not remove the cap from a HOT engine radiator. The sudden release of pressure from a heated cooling system can result in serious personal injury.

The engine cooling system is filled at the factory with a 50/50 mixture of water and ethylene glycol. This permanent type antifreeze contains rust inhibitors and provides protection to --35° F (--37°C).

The use of such a mixture is recommended for both summer and winter operation. When using water alone, be sure to add a reputable brand of rust inhibitor to prevent internal corrosion.

Test the freezing protection of the coolant every six months or prior to freezing temperatures.

Replenish with a fresh mixture every twelve months.

A drain for the system is located in the bottom radiator tank. An alternate method would be to disconnect a bottom radiator hose.

Sign off on the fresh mixture replenish

Air Cleaner Service Indicators Check

Lights (running, brake, & turn) check before towing

Pintle Eye Bolts check before towing

Sign off on the daily compressor maintenance

Every month or 500 miles, tighten the wheel lug nuts to 85 - 95 lbs.-ft. Every six months the wheel bearings, grease seals and axle spindles should be inspected for damage (corrosion, etc.) or excessive wear. Replace any damaged or worn parts.

Repack wheel bearings. Use a wheel bearing grease conforming to specification MIL--G--10924 and suitable for all ambient temperatures. Grease can be replaced in a wheel bearing using a special fixture or by hand as follows.

Place a spoonful of grease in the palm of one hand and take the bearing in the other hand. Push a segment of the wider end of the bearing down into the outer edge of the grease pile closest to the thumb.

Keep lifting and pushing the bearing down into the edge of the grease pile until grease oozes out both from the top and from between the rollers. Then rotate the bearing to repeat this operation on the next segment.

Keep doing this until you have the entire bearing completely filled with grease. Before installing bearing, place a light coat of grease on the bearing cups which are pressed in the hub.

NOTICE: Excessive grease in the hub or grease cap serves no purpose due to the fact that there is no way to force the grease into the bearing. The manufacturer’s standard procedure is to thoroughly pack the inner and outer bearing with grease and then to apply only a very small amount of grease into the grease cap.

If bearing adjustment is required or the hub has been removed for any reason, the following procedure must be followed to ensure a correct bearing adjustment of 0.001 to 0.012 free play.

1. While rotating hub slowly to seat the bearings, tighten spindle nut to approximately 15 lbs.-ft. Grasp the tire at the top and bottom and rock, in and out. There should be no evidence of looseness (free play) at the bearing.

2. Loosen nut to remove preload torque. Do not rotate hub.

Warning: Ensure the compressor is turned off and cooled down before starting the maintenance.

Check for grease, oil and dirt accumulation on the exterior surfaces of the oil cooler.

Upload a photo of the oil cooler before cleaning.

If there is accumulation, proceed with the cleaning. If not, skip to step 8.

Clean the oil cooler by directing compressed air containing a nonflammable safety solvent through the core.

Upload a photo of the oil cooler after cleaning.

Check if the cleaning removed the accumulation of grease, oil and dirt from the exterior surfaces of the oil cooler core.

If foreign deposits such as sludge and lacquer have accumulated in the oil cooler, proceed with the next steps. If not, the maintenance is complete.

Clean the oil cooler using a cleaning compound in accordance with the manufacturer’s recommendations.