RM600-2 Blade Replacement

[gulag1]

On of my winter projects. Do I understand correctly that these mowers use a left-hand thread so I need to go clockwise to loosen? I have the manual, but it doesn't say anything about blade replacement. Any other good tips? I simply planned to get under it, replace the blades. grease her up then go. Also, any suggestion on shear bolts? I think the ones I was using previously were a little light (#2s maybe????) as they continuously were breaking.

 

[sweetskillsrk]

I have an older RM306, but yes, the spindle bolts are LH thread. When you put the blades back on, get them guttentight, but no need to torque the heck out them. Because they're left hand thread and the blades rotate clockwise, they'll naturally get a little tighter as you cut. Those spindles ain't cheap so don't torque them like crazy and risk pulling the threads out. Impact gun them off and then long ratchet/short breaker bar them on. My model has friction discs on the blade hardware but it looks like yours just has a cup washer to keep constant pressure on the blade. When I got mine, I paid up for the right spindle hardware, it was all cobbled together with whatever washers the previous owner could find. As far as the shear bolt, I'd suggest grade 5. Also, if you don't have a slip clutch already, it would probably be a good idea to run one with it so the mower and your tractor are protected. Then again, if you know exactly where you're cutting and there's little chance of hitting something, you're probably fine without it.

 

[sweetskillsrk]

I forgot to mention too. Greasing the spindles is a pain in the butt and if something is time consuming and a pain in the butt, I likely won't do it as often as I should. Your model may not be too bad, but because my RM306 is belt driven, there's all kind of stuff on top of the spindles and in the way. So what I did was get some grease gun whip hoses and SAE-LT and NPT 1/8" adapters and ran 3 hoses from the spindles to the rear of the mower so I can easily shoot a pump or two of grease in the spindles after every other use.

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[gulag1]

Thanks! That's a big help.

 

[Russ from MN]

About greasing, we have a Husqvarna lawn tractor with sealed bearings on the spindles, regular use for over 25 years, no greasing, no problems! From my experience as a Millwright for 35 years is a good, sealed bearing will last as long as one that's greased, longer than one that's over greased!