Hydraulic motor is leaking... again

Topic: Hydraulic motor is leaking... again (Read 2417 times) previous topic - next topic

Re: Hydraulic motor is leaking... again

Reply #25 – April 09, 2019, 06:00:04 pm

National make a sleeve that slips on the shaft(if the shaft is cut from the original seal)
The (Redi-Sleeve comes in a kit with a matching seal).

Re: Hydraulic motor is leaking... again

Reply #26 – April 09, 2019, 06:18:11 pm

FT told that the only difference between the two motors is that one has a thermo-valve and the other does not. Is the thermo-valve something that can just be bolted on to the motor? If so, would it be possible or advisable to take the valve off the leaking motor and attach it to a new motor without the valve? Big savings since the motor with a valve is only $625. Purpose of the thermo-valve?

Re: Hydraulic motor is leaking... again

Reply #27 – April 09, 2019, 06:29:39 pm

Quote from: George Hatfield – April 09, 2019, 06:18:11 pm

FT told that the only difference between the two motors is that one has a thermo-valve and the other does not. Is the thermo-valve something that can just be bolted on to the motor? If so, would it be possible or advisable to take the valve off the leaking motor and attach it to a new motor without the valve? Big savings since the motor with a valve is only $625. Purpose of the thermo-valve?

I had the valve off to reseal my motors, the rebuilding kit came with seals to do either one, but the kit was around $125.00 and the seal only was around $4.00 I only used the kit for one and just the seal for the other.

Re: Hydraulic motor is leaking... again

Reply #28 – April 09, 2019, 06:33:15 pm

George check the national seal number against metric measurements. 20mm id =.787. 30mm od. = 1.181. 7mm thickness = .275
thickness is not as critical as ID and OD
Chris

Re: Hydraulic motor is leaking... again

Reply #29 – April 09, 2019, 06:40:26 pm

Quote from: George Hatfield – April 09, 2019, 06:18:11 pm

FT told that the only difference between the two motors is that one has a thermo-valve and the other does not. Is the thermo-valve something that can just be bolted on to the motor? If so, would it be possible or advisable to take the valve off the leaking motor and attach it to a new motor without the valve? Big savings since the motor with a valve is only $625. Purpose of the thermo-valve?

George I would suspect a good machine shop could do the attachment. I would be asking!
Chris

Re: Hydraulic motor is leaking... again

Reply #30 – April 10, 2019, 04:33:30 pm

I have a friend who is a machinist, he does a lot of oil field work . He uses a metal compound, comes in a can, mixed with a resin, it is as hard as steel. He applies it, waits for it to harden, when machined you are hard press to see the repair. What he likes is there is no heat input and it's a small area to repair.

Dave
Safe Travels

Re: Hydraulic motor is leaking... again

Reply #31 – April 10, 2019, 04:36:52 pm

The sleeves work fine. No need to take it all apart, Red loctite the sleeve push it on and done. Wipe off the excess. . push in new seal .

Re: Hydraulic motor is leaking... again

Reply #32 – April 10, 2019, 04:58:52 pm

We would use Belzona,is expensive but works,used it to repair a Cat engine block.

Re: Hydraulic motor is leaking... again

Reply #33 – April 10, 2019, 06:17:39 pm

John, I believe that is the name of the product my machinist friend uses.. He swears by it.. I have used sleeves on crankshafts for years . They work very well..
Safe Travels
Dave

Re: Hydraulic motor is leaking... again

Reply #34 – April 10, 2019, 06:30:38 pm

How to Repair a Shaft Using Forming Techniques - YouTube

Re: Hydraulic motor is leaking... again

Reply #35 – April 10, 2019, 06:35:07 pm

Quote from: jcus – April 10, 2019, 06:30:38 pm

How to Repair a Shaft Using Forming Techniques - YouTube

We did not use the form, just built it up with belzona then turned it down on a lathe.

Re: Hydraulic motor is leaking... again

Reply #36 – April 11, 2019, 08:43:29 pm

Quote from: John44 – April 09, 2019, 03:51:45 pm

Forgot what the process is called but we had a machinest that would put the shaft in a lathe and spray molten metal on the grove
to repair it.

TAFA Metalization was the name. I worked with them on grinding their sprayed hard-facing metals.

Seals also leak if the bearings are loose.

http://www.praxairsurfacetechnologies.com/en/components-materials-and-equipment/coating-equipment/thermal-spray-coating-systems

Re: Hydraulic motor is leaking... again

Reply #37 – April 15, 2019, 10:11:13 pm

I'm still undecided about what to do about my leaky hydraulic fan motor (the one with the thermo-valve $$$$). I thought for a while that it might just be leaky hose connection, but further study showed it is a leak from around the shaft. I wondered how much oil was leaking and rigged up a pan under the motor frame... definately Rube Goldberg inspired! But I think it is positioned such that it will catch any drops from above. See pic. I then drove the coach at highway speeds for about an hour. The result... not a single drop of oil in the pan. But there was an oil stain below the motor. We are taking a longer trip tomorrow (about 400miles round trip) and I'll keep the pan in place to see what happens.

My question is, what will likely be the end result if I don't repair this expensive leak for a while. I have a friend that drove his U320 40 for about 25000 miles with a leaky motor. Will the leak just get worse with time? Or is there a danger that the motor will fail catastrophically? Thanks in advance for any insights.

Re: Hydraulic motor is leaking... again

Reply #38 – April 15, 2019, 10:28:55 pm

My coach has had a weeping seal on the fan motor, just damp since 2006. Not to jinx myself. Rarely do the seals just blow out they usually just seep.

Re: Hydraulic motor is leaking... again

Reply #39 – April 16, 2019, 10:49:20 am

George, if everyone checked their fan motors that are in 10 to 20 Year old coaches I would wager that nearly all have some seep leak
I agree with bruce--I would just keep an eye on fluid level and watch the leak for volume --how big is the stain area.

IF that is the only leak you can just change the bottom seal as I posted earlier with a CR brand the size is 20mm X 30mm. X 7mm
on eBay I bought 3 for under 10.00
Chris

Re: Hydraulic motor is leaking... again

Reply #40 – April 16, 2019, 11:07:58 am

Agree, agree, with both above. For 5 years we have owned our coach, the fan motors have both seeped, but don't drip oil on the ground. To me, a significant distinction. I can live with a "seep" but not with a "drip". I HATE leaving a oil spot where I park our coach. Guess I developed the aversion early in life, when my first motorized vehicle was a BSA Gold Star 500 thumper.

(Note: Classic BSA engines were factory equipped with a "constant loss" oiling system. You poured oil in the top, and it ran out the bottom)

I would also agree with "watchful waiting" in this case. 95% probability doing so will not strand you on the side of the highway.

Re: Hydraulic motor is leaking... again

Reply #41 – April 16, 2019, 11:19:14 am

I don't want to derail this thread, but the below reminded me of my dad's 36' Harley VL. I remember being astounded when he told me about the constant loss oiling system with a dry sump and a separate oil tank. The end of the line for the oil as it dripped out was positioned above the drive chain to lubricate it with engine oil.
Don

Quote from: Chuck & Jeannie – April 16, 2019, 11:07:58 am

(Note: Classic BSA engines were factory equipped with a "constant loss" oiling system. You poured oil in the top, and it ran out the bottom)

Re: Hydraulic motor is leaking... again

Reply #42 – April 16, 2019, 11:31:03 am

Quote from: Don & Tys – April 16, 2019, 11:19:14 am

I don't want to derail this thread...

Oh what the heck - let's go ahead and derail it.

BSA went one step farther - the final drive chain was completely enclosed in a sheet metal chain guard. Enough oil leaked past the transmission output shafts to keep the chain nicely wetted down, and the chain guard kept it (relatively) clean. GENIUS!

Re: Hydraulic motor is leaking... again

Reply #43 – April 16, 2019, 11:49:34 am

Along the same lines I had a 69 Triumph Bonnville with the dual Amal carbs,every time you started it you primed the 2 buttons
on the carb until gas squirted out and got your fingers full of gas.

Re: Hydraulic motor is leaking... again

Reply #44 – April 16, 2019, 12:09:15 pm

Quote from: John44 – April 16, 2019, 11:49:34 am

Along the same lines I had a 69 Triumph Bonnville with the dual Amal carbs,every time you started it you primed the 2 buttons
on the carb until gas squirted out and got your fingers full of gas.

Same with BSA. And remember, that was LEADED gas soaking into our fingers! Probably explains some of my present-day cognitive impairment.

Re: Hydraulic motor is leaking... again

Reply #45 – April 16, 2019, 12:15:10 pm

Had some friends that took simichrome and polished the wrinkles off the valve covers then wondered why it ran hotter.

Re: Hydraulic motor is leaking... again

Reply #46 – April 16, 2019, 04:08:34 pm

I had both Beazer and the Trumpet ,I could sell the land where I parked them as a possible oil field...then.....I got me a Norton 750 first then a 850....no leaks...preferred the 750....

H

Re: Hydraulic motor is leaking... again

Reply #47 – April 16, 2019, 04:12:13 pm

PLEASE-- Let's get back to George's original topic: Hydraulic motor is leaking... again

I am sure that oil leaks on motorcycles and old DD two strokes are interesting, but not likely to enlighten him.

Thanks.

Brett/Moderator

Re: Hydraulic motor is leaking... again

Reply #48 – April 16, 2019, 04:56:07 pm

Mine weeps. Nothing on ground

Re: Hydraulic motor is leaking... again

Reply #49 – April 16, 2019, 05:35:27 pm

Quote from: wolfe10 – April 16, 2019, 04:12:13 pm

PLEASE-- Let's get back to George's original topic: Hydraulic motor is leaking... again

I am sure that oil leaks on motorcycles and old DD two strokes are interesting, but not likely to enlighten him.

Thanks.

Brett/Moderator

Agreed.....

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