Hi all,

On late model Greenfield ride-ons there is a brake disc attached to the rear axle, which is used for a parking brake or emergency brake system. On my mower (from about 2009), play has developed between this brake disc and the rear axle shaft, and in its keyway, so the brake disc may rotate slightly while the axle remains stationary. This seems like a problem.

[Linked Image]

The brake disc sits on the axle with no set screws, just a long rectangular key preventing it from rotating on the axle shaft. According to the diagram from the manual I've attached, the brake disc is intended to slide along the shaft to compensate for wear of the brake pads. So the disc must be loose enough to slide along the shaft to compensate for pad wear, yet the shaft must transfer torque to the disc through the key when applying the brakes. If there is any play in the keyway, the key will begin to move around when changing direction which is not good.

The problem began when the brake disc was removed in order to replace wheel bearings. Previously it was seized to the shaft and wouldn't even slide along the shaft, but after removal and re-installation it has subsequently developed play.

[Linked Image]

I'm concerned the key will eventually fail if I don't do something about it. Does anyone have any ideas/recommendations for how I could fix this? As pictured I have the rear axle/differential assembly removed from the mower at present.

Many thanks,
RLP

Last edited by RLP; 09/01/20 01:46 PM.