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Old 09-06-2020, 10:11 AM   #1
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Hydraulic Fan Drive Leak

Started finding a small drip on the concrete below the radiator. Looked up at it today and the hydraulic drive has accumulated hydraulic oil on the body of the drive that has started to drip. Has anyone repaired this type of a failure (and what does it look like)? I have not tried to tighten anything up yet. I decided to stop and ask the forum here first.
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Old 09-07-2020, 07:15 AM   #2
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Mine is dripping and I found this youtube video on how to replace mine. I haven't done anything about it yet. It's not a big drip and there is a lot of fluid in the tank. When I asked about it on the forum, one fellow said might be best to just leave it be. My fan motor would be a little north of $350 and is definitely something I could do.
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Old 09-07-2020, 10:08 AM   #3
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I had mine replaced at a local diesel repair shop in 2018. My records say: Replace hydrostatic fan motor 0700-FF1 $509.33, Freight $85, shop supplies $3, labor $385, tax $36.74
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Old 09-07-2020, 01:30 PM   #4
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I might hold until year end unless it is a sign of imminent failure?
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Old 09-07-2020, 05:11 PM   #5
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I would say it depends on how much it is dripping/leaking... I drove about 500 miles from NM to East Texas after I discovered mine leaking. I kept an eye on the reservoir and it wasn't leaking all that much so I had little fear of making it back to home base. My only concern was that at some point it might blow the leaking seal completely out ... probably not a likely scenario.
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Old 09-07-2020, 05:25 PM   #6
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Mine is leaking very slowly. But Iím going to clean it really good and see if I can find any leakage in storage at all.
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Old 09-20-2020, 01:07 PM   #7
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Replacement from Spartan is end of October. Is this a fire risk with a slow drip and a oil covered drive?
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Old 09-20-2020, 02:38 PM   #8
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I doubt it.
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Old 09-22-2020, 09:02 PM   #9
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I guess I just need to verify that the leak rate doesnít change while the coach is running. Iím guessing that the leak while stationary is caused by the discharge pressure of the pump leaking back. Thoughts?
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Old 09-23-2020, 07:12 AM   #10
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Mine dripped after stopping from the accumulation on everything, but not while parked & not running. I monitored fluid level every time I stopped all day from Eastern NM to East TX and found I was not losing much. Tech who looked at it in NM said my only risk, pretty remote, was that the leaking seal might totally blow out.
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Old 09-23-2020, 10:15 AM   #11
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Thanks for all the help!
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Old 09-25-2020, 09:16 AM   #12
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Quote:
Originally Posted by AFChap View Post
Mine dripped after stopping from the accumulation on everything, but not while parked & not running. I monitored fluid level every time I stopped all day from Eastern NM to East TX and found I was not losing much. Tech who looked at it in NM said my only risk, pretty remote, was that the leaking seal might totally blow out.
I have a spartan chassis - how do you check the fluid?
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Old 09-25-2020, 12:29 PM   #13
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Originally Posted by tomgrigsby View Post
I have a spartan chassis - how do you check the fluid?
On my 2003 Spartan Mountain Master chassis w/Cummins ISC the hydraulic fluid tank is just inside the rear access, to the left (driver side) of the engine. The large black tank has a cap w/dipstick built in. You only loosen it a bit, then pull it out. This tank runs your cooling fan, your power steering, and I would assume the hydraulic part of your air over hydraulic brakes. There is a spin-on filter w/meter just below it on my coach.

I lost my hydraulic filter while driving a couple of years ago and of course all the fluid was very quickly spewed out onto my toad. I got dash warning lights and sounds, and by the time I coasted to the side of the road I had no steering assist left. Refilling the tank took a little under 5 gallon.
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Old 09-25-2020, 12:50 PM   #14
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Quote:
Originally Posted by AFChap View Post
On my 2003 Spartan Mountain Master chassis w/Cummins ISC the hydraulic fluid tank is just inside the rear access, to the left (driver side) of the engine. The large black tank has a cap w/dipstick built in. You only loosen it a bit, then pull it out. This tank runs your cooling fan, your power steering, and I would assume the hydraulic part of your air over hydraulic brakes. There is a spin-on filter w/meter just below it on my coach.

I lost my hydraulic filter while driving a couple of years ago and of course all the fluid was very quickly spewed out onto my toad. I got dash warning lights and sounds, and by the time I coasted to the side of the road I had no steering assist left. Refilling the tank took a little under 5 gallon.
Got it - my tank is about a 2/3 dipstick length below the bed hatch. Fortunately I was able to check it and was about 2 quarts low. I don't have any idea how long it's been low. I bought the unit a year ago June and immediately drove it to about 2600 miles in 4 days. Since then I've driven about 1000 miles more. I'll start checking to see how severe my fan leak is, but I don't think it is bad. I'll have to get filters and plan on changing the oil per Spartan's recommendations. Thanks for the help.
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