Just repaired my Hayter Harrier 41 375a

[RGBGardening]

Hi,

New here, I've just replaced the rear rollars on my Harrier 41 375a, and although the rollars spin (when holding mower up) when placed on the grass, it won't self propel.

Was all working fine before I changed the rollars so I'm guessing I've missed something.

[Mick]

Hi, and welcome to TGM-Forum.

If it was working before the roller rebuild that suggests to me that you have fitted the roller cams and (or) keys the wrong way around. 

To check this, without the engine running and with the drive lever engaged you should be able to push the machine forwards and not pull it backwards.  If the wrong way around then you'll be able to pull it backwards but not push it forwards.