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1976 bombi - Steering bands

greenhornet

greenhornet

New member
Hi There,
I bought this unit last year and ran it all winter but found it hard to steer- required a lot of force on the levers.
I'm guessing that the bands are cooked but I was wondering if someone put the wrong oil in the diff could that cause this problem?
Also I was hoping that somone might have a leed on new bands or knew if they can be re-lined?
I was also hoping someone might have a line on the track belts or any suggestion on what to use for belts. I would like to make a repair kit of sorts to have as I will be taking it to some pretty remote places.
Your suggestions are much appreciated

Thanks
 
Find a local brake rebuilder and have them relined make sure you tell them the application you should pull cover off diff to check gears and be sure bands are worn, changing fluid should be a yearly thing saves alot of money if you catch things before they fail
 
I spoke with a local clutch rebuilder and he said it would be no problem to reline to bands for around $100. I read in another post about the cat
TO-4 30w oil to be the best for the steering box but this was for a different machine. Would it be the same for the bombi?

Thanks
 
many different brands of oil to use I use tdh, this is oil used for brake band and hydraulic tractor differentials, I have had good luck with this, but search forum there are many different brands to use just stay away from differential oils, find local supplier, bulk plant and see what they have.
 
I had the hard steering on my bombi and the bands were fine. All it took was some adjustment.
jim
 
I'm going to pop the lid off and take a peek. I have a feeling the last owner filled it with gear oil. Any idea how thick the lining should be at a minimum?
 
Well I got the lid off and its full of gear oil but the bands look good. I drained it and washed it out with varisol so I'm hoping with the right fluid it will steer better
 
RECOMMENDED OIL BRANDS AND THERE TYPE. FOR AND CONTROLLED DIFFERENTIAL.

JOHN DEERE HY-GARD
TEXACO TDH
SHELL DONAX TD
AMSOIL ATH
PENZOIL HYDRA-TRANZ
MOBIL MOBILFLUID 300
LUBRIPLATE UTF-C4
GULF UNIVERSAL TRACTOR FLUID
CHEVRON TORQUE FLUID
AMOCO 1000 FLUID
ESSO HYDRAUL 56
PETRO-CAN DURATRAN
UFA THG ULTRA
 
Hi Farmer Joe

At the base of the steering arms, there is an adjustment nut for the steering bands. The attached picture shows the threaded tensioning rods that are connected to the steering bands. Have you opened the differential case to check the steering bands?
 

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Thank you for the reply I just bought this 1976 BOMBI . I am 83 years old and have been riding Ski Doo's since 1968 the one that I have now is a 1988 long track but last winter told me that I needed something easier on my body so that is why I am trying this Bombi it will be a learning curve for me. We got our first 6 inches of snow about 4 days ago When I took it out it would steer left and right then after a few minutes the steering went away on the left side so I headed back to the barn the steering got bad on the right also . The reason I asked about the adjustment was that I thought it would help it steer better I tried to adjust both sides where you show in the photo with no luck . What is the proper setting for those adjusters ? The person that sold me the Bombi had just put in new brake shoes and oil I am wondering if the oil type is not right it is NAPA PREM PERF Gear oil SAE 80W-90 NP 75213
 
You need an oil meant for the steering bands. John Deere Hygard is one of the recommended lubricants.

LMC 1500 Rear differential fluid

Hey all! I have a slight leak in my rear diff of my 1986 LMC 1500.. Does anyone know what kind of fluid I should be putting back there? I’ve heard a few different opinions: - tractor hydraulic fluid (NAPA 85-405) - synthetic 5w-30 - CAT TO-4 - AeroShell 100 thank you!
www.forumsforums.com www.forumsforums.com
Check this thread.
 
Drain the 80-90w oil and go with a much lighter oil. I use the Amsoil power shift 50, but PJL and Vintagebike recommendations may be better (but all much lighter oils).

There is a drain plug directly under the differential, then a fill plug on the front right side….just in front of the axle.

If possible, verify that the brake bands are new (you can’t really tell unless you pull cover, then look at bottom of differential where the wear takes place…I made that mistake myself).

Bob
 
Bobcatbob said:
Drain the 80-90w oil and go with a much lighter oil. I use the Amsoil power shift 50, but PJL and Vintagebike recommendations may be better (but all much lighter oils).

There is a drain plug directly under the differential, then a fill plug on the front right side….just in front of the axle.

If possible, verify that the brake bands are new (you can’t really tell unless you pull cover, then look at bottom of differential where the wear takes place…I made that mistake myself).

Bob
Click to expand...
Bobcatbob said:
Drain the 80-90w oil and go with a much lighter oil. I use the Amsoil power shift 50, but PJL and Vintagebike recommendations may be better (but all much lighter oils).

There is a drain plug directly under the differential, then a fill plug on the front right side….just in front of the axle.

If possible, verify that the brake bands are new (you can’t really tell unless you pull cover, then look at bottom of differential where the wear takes place…I made that mistake myself).

Bob
Click to expand...
Will it do any good or harm to put in 2 gal of diesel fuel and drive forward and back in a straight line to wash out the old oil after I drain it out ?
 
Bobcatbob said:
Hi Farmer Joe

At the base of the steering arms, there is an adjustment nut for the steering bands. The attached picture shows the threaded tensioning rods that are connected to the steering bands. Have you opened the differential case to check the steering bands?
Click to expand...
Bobcatbob I just took the cover off and have new brake shoes they look different than the new ones ? Also how do I remove the old shoes
DD0B0902-67D7-4698-A917-70DBDB853C63.jpeg
 
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