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Author Topic: Lt40 up/down motor  (Read 326 times)

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Offline Crossroads

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Lt40 up/down motor
« on: September 08, 2020, 11:28:16 PM »
I recently started having issues when I get to a job site. Where when I try to lift the head up to clear the loading arms. It starts out a normal speed, then starts to bog down until it shuts off the simple set. When it starts to jog down, if I stop for a few seconds, it will start out normal again, then start to big down again. It does it with or without the engine running, but after the first few cuts it stops and works normal for the rest of the day. I have replaced the battery, that didnít fix the issue. I checked the alternator and IĎM getting 15v. Tomorrow night I plan to remove and clean the wires to the alternator. Anyone have any other suggestions? 
2017 LT40 wide, Kubota l185dt, 2-036 stihl, 2001 Dodge 3500 5.9 Cummins, l8000 Ford dump truck, hr16 Terex excavator, Farmi logging winch.

Offline Southside

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Re: Lt40 up/down motor
« Reply #1 on: September 08, 2020, 11:38:12 PM »
Have you checked the chain tension and chain itself?  Maybe there is a stiff section that it binding up the motor?  Also check the rollers, could be you have a bearing going out and it gets sticky until it moves around a bit and looses up.  
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Offline terrifictimbersllc

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Re: Lt40 up/down motor
« Reply #2 on: September 09, 2020, 01:38:21 AM »
Also, always Lube the mast rails at beginning?  Check theyíre not adjusted too tight?
DJ Hoover, Terrific Timbers LLC,  Mystic CT Woodmizer Million Board Foot Club member. 2019 LT70 Super Wide 55 Yanmar,  LogRite fetching arch, WM BMS250 sharpener/BMT250 setter.  2001 F350 7.3L PSD 6 spd manual ZF 4x4 Crew Cab Long Bed

Offline Magicman

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Re: Lt40 up/down motor
« Reply #3 on: September 09, 2020, 04:25:45 PM »
Also clean out the clogged sawdust between the sets of mast pads (4 different places) and then give that a good shot of ATF.
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Offline Bruno of NH

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Re: Lt40 up/down motor
« Reply #4 on: September 09, 2020, 04:46:09 PM »
Can you lube the mast rails with atf.
My manual says to use something different.
If you folks use atf please let me know.
Lt 40 wide with 38hp gas and command controls Riehl Steel edger,F350 4x4 dump and lot of contracting tools

Offline terrifictimbersllc

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Re: Lt40 up/down motor
« Reply #5 on: September 09, 2020, 07:31:48 PM »
Used atf for 18 yrs on my 2001 lt40 super, mast surfaces, with every setup.
DJ Hoover, Terrific Timbers LLC,  Mystic CT Woodmizer Million Board Foot Club member. 2019 LT70 Super Wide 55 Yanmar,  LogRite fetching arch, WM BMS250 sharpener/BMT250 setter.  2001 F350 7.3L PSD 6 spd manual ZF 4x4 Crew Cab Long Bed

Offline Bruno of NH

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Re: Lt40 up/down motor
« Reply #6 on: September 09, 2020, 07:37:01 PM »
The part of the mast that has a black finish on it ?
That the white pads ride on?
Lt 40 wide with 38hp gas and command controls Riehl Steel edger,F350 4x4 dump and lot of contracting tools

Offline terrifictimbersllc

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Re: Lt40 up/down motor
« Reply #7 on: September 09, 2020, 07:41:48 PM »
Not sure what new ones look like but yes where the pads contact. On mine it was steel. If new ones are different canít comment on atf use.
DJ Hoover, Terrific Timbers LLC,  Mystic CT Woodmizer Million Board Foot Club member. 2019 LT70 Super Wide 55 Yanmar,  LogRite fetching arch, WM BMS250 sharpener/BMT250 setter.  2001 F350 7.3L PSD 6 spd manual ZF 4x4 Crew Cab Long Bed

Offline Crossroads

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Re: Lt40 up/down motor
« Reply #8 on: September 09, 2020, 10:22:25 PM »
Worked late tonight, so Iíll have to wait to check these things. Mast pads are pretty clean, I use atf before I start and at mid day. Also, use a leaf blower several times a day to blow the sawdust from around the motor, mast, battery box , and rails. Iíll keep yíall posted when I get time to work on it again. Thank you....
2017 LT40 wide, Kubota l185dt, 2-036 stihl, 2001 Dodge 3500 5.9 Cummins, l8000 Ford dump truck, hr16 Terex excavator, Farmi logging winch.

Offline Crossroads

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Re: Lt40 up/down motor
« Reply #9 on: September 11, 2020, 11:39:55 PM »
Finally got some time to work on the up/down issue today. Checked for , binding, dirty pads, chain, electrical connections. Then got out the volt meter, but didnít find anything remarkable. Thatís when I admitted defeat and called MW electrical tech. First thing he had me pull the front off the the simple set and watch the voltage on the breaker for the up/down/simple set. Then he had me bypass the breaker and connect all 3 wires to 1 terminal. Problem solved, well problem located. I still need to replace that 50a breaker. 
2017 LT40 wide, Kubota l185dt, 2-036 stihl, 2001 Dodge 3500 5.9 Cummins, l8000 Ford dump truck, hr16 Terex excavator, Farmi logging winch.


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