Slew cylinder barrel 559/70191 JCB 3CX/4CX, aftermarket

For the JCB 3CX and 4CX backhoe loaders: slew cylinder barrel 559/70191, an aftermarket part.

The bore, length, port positions and eye of a barrel are specific to the cylinder, so the barrel is chosen by part number and compared with the old one. Before assembly, clean the bore and oil it with clean hydraulic oil, since a scratch in it will damage the new seals. The rod taken from the old cylinder must be straight with its chrome intact, and the seal grooves of the piston and gland must be cleaned. When the gland goes into the barrel, guide the seals past the threads and edges without catching them. The aftermarket barrel comes painted; its ports and bore are protected in transit, and the caps stay on until assembly. Check the union threads and seals of the pipe on the barrel as well, since a damaged union will leak even with a new barrel. The aftermarket barrel is made to the dimensions of the original barrel under this number and fits in place of the old one without modification. Choose the barrel by part number and compare it with the old one.

Specifications

Compatibility

The barrel belongs to the slew cylinder that swings the backhoe; the photo shows its threaded end. Other parts are in JCB hydraulic cylinders.

Fitting

Do not use sharp tools when fitting the seals; fitting cones and clean oil help the seals go in without damage. Check the lip direction of the new seals against the old ones, since a seal fitted the wrong way round leaks at the first pressure.