Clutch piston (transmission) 445/34100 JCB, aftermarket

Clutch piston (transmission) 445/34100 is an aftermarket part for the JCB machines.

The clutch piston works inside a clutch drum in the gearbox: when a gear is selected, pressurised oil enters the drum, the piston moves and squeezes the friction and steel plates together, and the clutch locks; when pressure is released, return springs push the piston back. Seals on the piston hold the pressure. A cracked piston, worn seal grooves or a piston sticking in the drum lead to incomplete locking, slipping, burnt plates or a gear that does not fully disengage. If the piston returns slowly or sticks, check the strength of the return springs and the drum bore. The piston's outer surface must be smooth.

Specifications

Compatibility

According to the product card, 445/34100 is a clutch piston. Fit is confirmed by the part number. Other parts are in Transmission.

Fitting

On assembly, wet the piston seals with clean transmission oil and push the piston into the drum squarely without cutting the seals. Fit the return springs and retaining circlip using a suitable press. Soak the plates in oil, stack them in order and measure the pack clearance. After the gearbox is assembled, check the clutch pressures with a gauge. In the first hours after the repair, watch the transmission oil temperature and level, and do the first oil and filter change earlier than usual.