LT40 Hydraulics

[jpgreen]

You did check the oil level right?  Cause low fluid and a leak will cause your problem every time.

[WH_Conley]

Changed filter, drained system, put in thinner oil. At the suggestion of a neighbor took apart the by-pass valve and cleaned it. Same thing. The neighbor has a hydraulic shop, supposed to be here this morning with his test equipment.

[backwoods sawyer]

Check the ground conection on the pump and clean the paint off from under it where the strap bolts to the box.

[pnyberg]

WH,  did you solve this problem? 

Thanks,
    Peter

[Bibbyman]

My WM Super Hydraulic mill has 5246 hours on it, and the brushes & motors are original.  Maybe the higher HP hydraulic motors (2) make a difference  ???  That's why I was surprised.  I thought they all lasted like that..... ;)

The brushes on the first motor on our 2002 Super went out at a bit over 1500 hours.  We had new brushes put in by motor shop.  The brushes in the second motor went out before 2000 hours.  Same thing.  They both lasted about another 500 hours each with the motor shop brushes.  This time the armatures were worn too much to replace the brushes.  That's when we looked at the cost of new motors or to replace them with an external power pack.  We chose to go to a power pack.  Not an option for many people.

I'm not sure what makes the difference between your mill and ours that the motors on your mill are still holding up.  Maybe I "bumped" the valves a lot more.  I suspect starting the motor takes the heaviest toll on the brushes.  Just a guess.

[WH_Conley]

Yep, replaced the entire pump assembly. Works as good as it ever did. The whole pump and motor cost less than motor by its self. The only thing left was to replace the pump body. That also cost more than the complete package. Anybody need a motor, I have extras.

[isawlogs]

 What  year is your mill . ???  I'd be interested in the motor ifin it would fit mine.

[WH_Conley]

97 LT40HD. I have to go back down to the mill later, I will look and see what brand.

[isawlogs]

Mines a '93 I doubt that it would fit unless it can be retrofitted.

[WH_Conley]

Monarch is the brand name of the power unit.

[isawlogs]

 I'll check with WoodMizer and see if that would fit.

[woodyone.john]

So now my brushes are kaput. '99 40 super twin monarch pumps kiwi $500 + tax +freight each per motor to replace Has anybody done the build/make your own brushes mod yet.I would love to hear about this. our local franchisee says he has some some place but it sounds like hes looking for some one whose real desperate. :P cheers john

[Magicman]

My local alternator/starter repair shop rebuilt mine.  Bearings, two new brush rack assemblies and an armature that was fried when the brushes failed.

[woodyone.john]

thanks mm.

[JustinW_NZ]

So now my brushes are kaput. '99 40 super twin monarch pumps kiwi $500 + tax +freight each per motor to replace Has anybody done the build/make your own brushes mod yet.I would love to hear about this. our local franchisee says he has some some place but it sounds like hes looking for some one whose real desperate. :P cheers john

Bummer, sounds expensive :(

I just pulled my two pumps/motors apart and gave them a BIG clean out.
The brushes were ok, but bearings not so flash, they were a simple off the shelf part if that helps ($7 each from memory)

Would love to know how you get on in case I have to go down the same path :(

Cheers
Justin

[woodyone.john]

Justin,found some one who can make new brushes to suit.approx$100/motor If they were ordered by the 100 they would be much cheaper.Makes me wonder why WM and or it agencies dont do that and hold them in stock.I will need to solder them to the sub assembly.

[terrifictimbersllc]

Just had my LT40 Super Monarch (bosch) motors rebuilt last week at the 1500 hours point.  One had brushes all shot, the other, one out of the four brushes was just about gone. For both the repair was  1) new bearings 2) new brushes 3) turn down the armature small diameter which contacts the brushes.  I think if this isn't turned the new brush life will be much shorter than it should be.  Cost was $190 for one at an electric shop and $85 for another at a starter place.  The electric shop didn't have enough brushes to do both so I took the second one to the starter place. He had to order new brushes but got them overnight. They were a bit shorter than those from the electric shop.    Now the motors are running side by side and I get to see who's fix was best.

[woodyone.john]

New bushes cost $25 including tax. got them made with 6 inch tails. soldered them on to the other tailsafter sleeving them.nowthe whole hydraulic system is together again with new oil,and working well. cheers john

[Chuck White]

Great to hear that John, happy sawing! 

[Magicman]

Good job John.     Sometimes we just have to do what we have to do.