Author Topic: grinding gears  (Read 9864 times)

andy

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grinding gears
« on: August 08, 2014, 01:13:02 PM »
Ok, so the old girl is running, i have driven around my property for the last month off and on. Getting down to adjustments one that has dogged me is the shifting. I have set the proper specs for clutch adj, but still she grinds going into any gear. it all runs fine once in gear, just going into gear. Is there a trick? New clutch ass, and TO bearing so not those i hope,

Andy
1943 M4A1 (restored to M2A1)

spec4don

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Re: grinding gears
« Reply #1 on: August 08, 2014, 02:09:15 PM »
Andy, I'll bet it's your shifting. Probably shifting too fast and running the rpms up to far. Someone once said that the halftrack has the rolling resistance of a rock. It slows down really quick so making the shift especially in low transfer is kind of an art. As I've driven mine more I'm starting to grind alot less. Also starting to get the double clutching down helps. Straight tooth gears got to match rpms and road speed.

Don G.
1941 M2A1 not restored
1942 M3 Diamond T Mostly restored
1943 M3A1 Under restoration
1967 M51A2 Tractor
1945 WC 63 needs restoration
1967 M36 Long wheel base duece
1951 M135 GMC Fire truck conversion

andy

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Re: grinding gears
« Reply #2 on: August 08, 2014, 05:34:39 PM »
You really are my hero Don lol,
Can you explain the double clutching. So i feel better im not the only one grinding  :)

Andy

Andy, I'll bet it's your shifting. Probably shifting too fast and running the rpms up to far. Someone once said that the halftrack has the rolling resistance of a rock. It slows down really quick so making the shift especially in low transfer is kind of an art. As I've driven mine more I'm starting to grind alot less. Also starting to get the double clutching down helps. Straight tooth gears got to match rpms and road speed.

Don G.
1943 M4A1 (restored to M2A1)

spec4don

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Re: grinding gears
« Reply #3 on: August 08, 2014, 07:20:04 PM »
Andy it's kind of hard to explain but as you throttle up and get up to max speed for the gear, push in the clutch move the shifter to neutral let out the clutch, push it back in and ease it into the next highest gear. The down shift is the same except when you have the clutch out in neutral you give it some gas to bring the engine rpm up to match the gear speed then push in the clutch and let off on the gas and slide it into gear. Don't be in a hurry!

I've also found that I don't use first gear in high or low range to start out, I start out in second. Works a lot better.

1941 M2A1 not restored
1942 M3 Diamond T Mostly restored
1943 M3A1 Under restoration
1967 M51A2 Tractor
1945 WC 63 needs restoration
1967 M36 Long wheel base duece
1951 M135 GMC Fire truck conversion

autocar925

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Re: grinding gears
« Reply #4 on: August 09, 2014, 09:51:19 AM »
Even if you are used to double clutching, the thing to remember about a halftrack is that you can not rush the shift.  It will shift when it wants to and there is nothing you can do about it.  You have to take your time and shift it nice and easy.  Sounds like a goofy explanation, but once you drive a halftrack, you'll see what I mean.

spec4don

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Re: grinding gears
« Reply #5 on: August 09, 2014, 10:24:17 AM »
What Dennis said ;D

Don G
1941 M2A1 not restored
1942 M3 Diamond T Mostly restored
1943 M3A1 Under restoration
1967 M51A2 Tractor
1945 WC 63 needs restoration
1967 M36 Long wheel base duece
1951 M135 GMC Fire truck conversion

andy

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Re: grinding gears
« Reply #6 on: August 09, 2014, 10:25:40 AM »
You guys are great. Im sure this will help others to!

1943 M4A1 (restored to M2A1)

vj

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Re: grinding gears
« Reply #7 on: March 08, 2016, 07:43:50 AM »
I have heard  that 140 gear oil will help It,s    It suppose to slow the gears down faster, but don,t know for sure.