The Forestry Forum is sponsored in part by:

iDRY Vacuum Kilns


Forestry Forum
Sponsored by:


TimberKing Sawmills



Toll Free 1-800-582-0470

LogRite Tools



Norwood Industries Inc.




Your source for Portable Sawmills, Edgers, Resaws, Sharpeners, Setters, Bandsaw Blades and Sawmill Parts

EZ Boardwalk Sawmills. More Saw For Less Money!

STIHLDealers.com sponsored by Northeast STIHL


Woodland Sawmills

Peterson Swingmills

 KASCO SharpTech WoodMaxx Blades

Turbosawmill

Sawmill Exchange

Michigan Firewood, your BRUTE FORCE Authorized Dealer

Baker Products

ECHO-Bearcat

iDRY Wood Lumber Vacuum Drying for everyon

Nyle Kiln Dry Systems

Chainsawr, The Worlds Largest Inventory of Chainsaw Parts

Smith Sawmill Service



Author Topic: Accessories work but not when motor is running  (Read 578 times)

0 Members and 1 Guest are viewing this topic.

Offline Jenfeist

  • member
  • *
  • Posts: 2
  • I'm new!
    • Share Post
Accessories work but not when motor is running
« on: December 08, 2019, 11:20:54 AM »
I have an LT 40 HD with 4500 hours on mill, the last 12 hours running on a new motor. Here's the problem: when the motor is running or ignition switch is in run position the for/rev and up/down motors do not work. When the ignition is in accessory position they both work fine. (I haven't used the blade guide motor for years). I tested the hot leads coming out of the circuit breaker block going to each drum switch. They have 12 volts in both the accessory and run positions of the key switch. So is this a bad ignition switch or a circuit board problem? According to the 1992 series wiring diagram the up/down doesn't go through the circuit board. 

Offline charles mann

  • Senior Member x2
  • *****
  • Posts: 1017
  • Location: Ft. Hood, Tx
  • Gender: Male
    • Share Post
Re: Accessories work but not when motor is running
« Reply #1 on: December 08, 2019, 12:57:11 PM »
What about running a jumper from the acc to the ign terminal and see if the motors work with eng running. 

Im running into a similar issue with getting my eng to even crank. Iv got 12v from the master switch to the push button and 12v on the closed terminal, down to the relay. Same for the high idle relay, power to the input side, 12b to the S on the relays when the master comes on and the starter button is closed. But eng no crank. I can jump the relay and it works. Chances of 2 new relays being bad i find slim, but not impossible. 
Temple, Tx
Fire Fighting and Heavy Lift Helicopter Mech
Helicopter and Fixed Wing Pilot

Offline Jenfeist

  • member
  • *
  • Posts: 2
  • I'm new!
    • Share Post
Re: Accessories work but not when motor is running
« Reply #2 on: December 08, 2019, 01:40:02 PM »
I am considering trying that but am only "dangerously knowledgeable" about electrical testing. I have created a dead short in the past, several years ago...I did set up a jumper wire and insulated pliers to hold it with but haven't applied it yet. Wondering if I should check grounding contact and bar that runs under mill frame. Maybe this evening...we have drawknifing to finish before below zero weather moves in for a few days.

Offline charles mann

  • Senior Member x2
  • *****
  • Posts: 1017
  • Location: Ft. Hood, Tx
  • Gender: Male
    • Share Post
Re: Accessories work but not when motor is running
« Reply #3 on: December 08, 2019, 03:10:40 PM »
I am considering trying that but am only "dangerously knowledgeable" about electrical testing. 
you and me both. 
i burned out a rectifier the other day by jumping a terminal. luckily, i don't think i need it. poor grounds can make a man pull his hair out.
i know you said you had voltage from the cb block. do you have voltage to the drum input connection? if so, do have voltage on the output side of the drum? if so, then keep checking the wires all the way to the motors. if no voltage out of the drum, it may be the drum switch. 
worrying about shorts, put a fuse inline on the jumper lead. to much draw, it'll pop the fuse. 
Temple, Tx
Fire Fighting and Heavy Lift Helicopter Mech
Helicopter and Fixed Wing Pilot

Offline Magicman

  • Senior Member x2
  • *****
  • Posts: 41806
  • Age: 78
  • Location: Brookhaven, MS
  • Gender: Male
  • A "Traveling Man"
    • Share Post
    • Knothole Sawmill
Re: Accessories work but not when motor is running
« Reply #4 on: December 08, 2019, 03:37:13 PM »
You need to take a test lamp (or voltohmmeter) and determine where you have voltage when the key switch in the various positions.  Jumpering 12v. to the switch's "on" position would be a normal troubleshooting test.
Knothole Sawmill, LLC     '98 Wood-Mizer LT40SuperHydraulic   WM Million BF Club Member   WM Pro Sawyer Network

Never allow your "need" to make money to exceed your "desire" to provide quality service.....The Magicman

Offline Southside

  • Administrator
  • *****
  • Posts: 9324
  • Age: 49
  • Location: Wilsons (Dinwiddie County), VA
  • Gender: Male
  • Have a plan to saw every log you meet.
    • Share Post
    • White Oak Meadows
Re: Accessories work but not when motor is running
« Reply #5 on: December 08, 2019, 05:21:55 PM »
A power probe is worth it's weight in gold when trying to diagnose issues like this. You can apply ground or power to a circuit and eliminate what is working and what is bad, IE switch, wire, motor, relay. About $60, combine that with a multi meter and the Gremlins become a whole lot less aggravating. 
Franklin buncher and skidder
JD Processor
Woodmizer LT Super 70 and LT35 sawmill, KD250 kiln, BMS 250 sharpener and setter
Riehl Edger
Woodmaster 725 and 4000 planner and moulder
Enough cows to ensure there is no spare time.
White Oak Meadows

Offline charles mann

  • Senior Member x2
  • *****
  • Posts: 1017
  • Location: Ft. Hood, Tx
  • Gender: Male
    • Share Post
Re: Accessories work but not when motor is running
« Reply #6 on: December 11, 2019, 12:50:09 AM »
Any progress to report? 
Temple, Tx
Fire Fighting and Heavy Lift Helicopter Mech
Helicopter and Fixed Wing Pilot

Offline Florida boy

  • Full Member x2
  • ***
  • Posts: 147
  • Age: 31
  • Location: Northwest florida
  • Gender: Male
  • Young sawyer with my first mill
    • Share Post
Re: Accessories work but not when motor is running
« Reply #7 on: December 13, 2019, 08:33:58 AM »
I would look for grounds . Most items in 12v ground through frame . I've been having up down problems on my manual mill .this is how I test for grounds. Take a meter or test light and hook red lead to 12v from battery and use black lead to test for grounding....

I was on a service call once where a  fan was not working. Looked at taps on fan. Looked good checked voltage had proper voltage. Thought fan was bad so I started to take it down. Once I pulled th taps loose I could see corrosion in between the connection points. Had voltage on the part I touched with meter . Reconnected and ran fine... Dissimilar metals like to corrode in places that aren't apparent. Best of luck


Share via delicious Share via digg Share via facebook Share via linkedin Share via pinterest Share via reddit Share via stumble Share via tumblr Share via twitter

xx
Running hyd motor in fwd and rev.

Started by Jim1934 on Sawmills and Milling

61 Replies
1658 Views
Last post June 17, 2021, 10:39:52 PM
by mike_belben
xx
3 phase motor running backwards???

Started by LandfillLumber on Alternative methods and solutions

1 Replies
5553 Views
Last post June 28, 2009, 09:12:43 PM
by Ironwood
xx
how does a bar oiler work - hot running bar

Started by rebocardo on Chainsaws

8 Replies
1984 Views
Last post October 27, 2003, 08:16:30 PM
by rebocardo
xx
LT40 Super drive motor out......debarker will work fine....

Started by boman1 on Sawmills and Milling

2 Replies
1223 Views
Last post July 12, 2009, 06:51:41 PM
by boman1
 


Powered by EzPortal