The cab tilt system has two main parts that can fail: the pump, which builds the pressure, and the cylinder, which lifts the cab. Hoses connect them. Knowing which one has failed saves you from buying the wrong part.

What each part does

The pump is operated by hand lever or by an electric motor. It pushes oil through the hoses to the cylinder. The cylinder pushes the cab up and holds it there. The hoses carry the oil between the two.

Signs of a failed pump

The lever feels loose or has no resistance. The lever moves but the cab does not rise. Oil is visible on the pump body. The cab rises very slowly even when the oil level is correct and the system has been bled.

Signs of a failed cylinder

The cab rises but then sinks back down. Oil is visible around the cylinder rod or on the tube. The rod is scratched or pitted. The cab rises unevenly on trucks with two cylinders.

Signs of a hose problem

Oil at the hose ends, a hose that is swollen, cracked or rubbing against the frame, or a hose that is kinked. Replace old hoses in pairs when one has failed, because the other has the same age and wear.

Do not forget the seals

Many pump and cylinder problems come from worn seals only. A repair kit costs less than a new part. See our list of pump and cylinder repair kits.

Still not sure?

Send us the truck model and year, a photo of the part and a short description of the problem. We will tell you which part we think has failed and what you need to order.

OE numbers and truck brand names are for reference only. RHAP parts are aftermarket parts, not original parts from the truck manufacturers.

Wenzhou Ruiheng Auto Parts (RHAP) supplies aftermarket cab tilt pumps, cab tilt cylinders, hoses and repair kits for European heavy-duty trucks, including Volvo, Mercedes-Benz, Scania, MAN, Renault, Iveco and DAF. Send us the OE number, VIN or a photo and we will confirm the right part before you order.