Go BottomChange to lighter wt hydraulic oil
 | corvetteguy
Join Date: Mar 2005 Posts: 49 PA 
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2006-09-08 134076
Winter is coming up and last year my
JM-180 3 point took many warm up minutes
before I could lift the rear blade and
pull some snow.
I have some new oil (5 Gal) and would like to
change it without breaking into the hydraulic
system and run th pump dry.
Since the oil drain is in the front and the
dipstick is in the rear what do you think of
slowly releasing oil from the front while
infusing new oil from the rear.
I figure a 5 gallon flush while it is running
would yield mostly lighter wt oil in the sump.
Yes?
No?
George
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 | Art White
Join Date: Jan 2000 Posts: 6898 Waterville New York 
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2006-09-08 134077
No! If you chose to drain then do it and not worry but you should make sure both oils are compatable with each other as the chances of removing all the gear oil is slim to none. You might find that you have some shafts that might give you trouble later as the thin oil might not hold as well as the gear oil for lubrication. You may find some seals that will weep as well do to the machining tolerances. I ran in to this a few years ago with a Kubota grey market tractor that a fellow bought a loader for and his intended use was for snow removal but it took about 45 minutes to get warm enough to use. ....
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 | Murf
Join Date: Dec 1999 Posts: 7249 Toronto Area, Ontario, Canada
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2006-09-08 134082
George, try a magnetic type block heater or two. We use them all the time and they really make a difference.
As long as you can get electricty to the machine.
Best of luck. ....
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| chipuren
Join Date: Jul 2003 Posts: 193 Arkansas
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2006-09-08 134222
the hydraulic oil is separate from the trans. the drain is on the rear of the lift box. If you look at the bolts that hold the bracket for the top link, there is one on the left that is a bit lower than the others, this one is the drain. Unless yours is one of the newer type with the spin on filter on the right side of the engine, there is a strainer under the seat under a cover with 3 bolts that also has a pipe attached (supply line to pump. To completely drain, you may want to disconnect the line at the pump and can even remove the rear top link bracket to expose the inside of the lift box to wash it out. The factory uses an oil that is appx 30 wt motor oil, very slow in the cold. a lighter oil will help a lot. ....
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 | greg_g
Join Date: Jan 2004 Posts: 1816 Western Kentucky 
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2006-09-08 134224
The drain is in the back George, about a foot below the dipstick. It looks like a hex head bolt, but it's really the drain plug. If you've never removed the oil that came with it, you should drain it - then flush the entire hydraulic system with kerosene - run it to circulate the kero - drain. I use a piece of screen over a bucket to catch any big chunks that come out. That way I might be able to reuse the kero if it looks like a 2nd flush is called for. When you're satisfied it's clean and empty, refill with 9.5 quarts of AW32 non-foaming hydraulic fluid. ....
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