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20W-50 for a hydraulic pump in a hydrostatic trans #4106884 05/26/16 03:48 AM
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ford46guy Offline OP
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Posted in another section about a VST 205-024c Peerless trans in a murray mower but want some opinions on the best fluid.
There are two chambers (one is easy, takes 80W90). The other is controversial...

The choices are a mystery peerless oil vs 20W50(which many say works exceptionally).
20W50 comes in Motorcycle flavor or race oil (which has lots of zinc).

The mystery oil has to be delivered and is expensive, and I'm leaning to a synth 20W50. Any opinions on this? Probably anything would be better than what came out of it!

Last edited by ford46guy; 05/26/16 03:49 AM.

95 Tbird V8 240K PP SYNTH ULTRA 5W30
98 MGM 160K M1 HM 5W20
96 Explorer EB V6 159K PP SYNTH HM 5W30
95 Conti 155K MC 5W20
11 GS350 90K PP HM 5W30
Re: 20W-50 for a hydraulic pump in a hydrostatic trans [Re: ford46guy] #4106885 05/26/16 04:09 AM
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KingCake Offline
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Hydraulic oil usually doesn't have moly or zddp in it because those additives will form sludge in a gear box. They also have protection for yellow metals.

You can buy 20 weight hydraulic oil cheap at tractor supply. 30 weight too. There's also syncromesh.

Re: 20W-50 for a hydraulic pump in a hydrostatic trans [Re: ford46guy] #4106887 05/26/16 04:31 AM
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zeng Offline
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What's your typical max/high side operating temperatures of the two chambers i.e 80W90 and 20W50(recommended by OEM?) as well as lowest/highest ambient temperatures? blush

Re: 20W-50 for a hydraulic pump in a hydrostatic trans [Re: ford46guy] #4106995 05/26/16 08:22 AM
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ford46guy Offline OP
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This unit is essentially a throw away unit, but it will be running in temps say 32-95. No winter.

Maybe in light of this the OEM fluid is best to get?


I see people using the 20w50 motorcycle oil for years, and some manufactures suggest exactly that fluid.


95 Tbird V8 240K PP SYNTH ULTRA 5W30
98 MGM 160K M1 HM 5W20
96 Explorer EB V6 159K PP SYNTH HM 5W30
95 Conti 155K MC 5W20
11 GS350 90K PP HM 5W30
Re: 20W-50 for a hydraulic pump in a hydrostatic trans [Re: ford46guy] #4107051 05/26/16 09:16 AM
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Oldmoparguy1 Offline
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Isn't that the unit that many are using M1 15W-50?


A Randomly Selected Thought For The Day:
If Noah had used Zip, he could have used a smaller boat.
Re: 20W-50 for a hydraulic pump in a hydrostatic trans [Re: Oldmoparguy1] #4107053 05/26/16 09:21 AM
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ford46guy Offline OP
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Originally Posted By: Oldmoparguy1
Isn't that the unit that many are using M1 15W-50?

That or 20W50. Some guy updates that his is running great for years.

Don't motorcycles have a similar wet clutch system?


95 Tbird V8 240K PP SYNTH ULTRA 5W30
98 MGM 160K M1 HM 5W20
96 Explorer EB V6 159K PP SYNTH HM 5W30
95 Conti 155K MC 5W20
11 GS350 90K PP HM 5W30
Re: 20W-50 for a hydraulic pump in a hydrostatic trans [Re: ford46guy] #4107098 05/26/16 10:37 AM
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loneryder Offline
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My Toro Z master commercial calls for Mobil 1 15-50. It's 12 yrs old. I change it every other year. It has separate pump/motor and is commercial grade.

Re: 20W-50 for a hydraulic pump in a hydrostatic trans [Re: ford46guy] #4107099 05/26/16 10:38 AM
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austinlunsford Offline
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All the eXmarks, Scag, yazoo I've used use M1 15w50


1997 F250 HD 7.3: Rotella T6 5W-40
2002 Mustang GT: M1 0W-20 EP
2002 F150: Edge 0W-20
Re: 20W-50 for a hydraulic pump in a hydrostatic trans [Re: ford46guy] #4107122 05/26/16 11:16 AM
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Michael_P Offline
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I run Castrol or Mobil 5W50 syn and have for years on my Tuff Torq K51. I have over 1000 hours of trouble free use. I have used 20W50 conventional with no problems on various hydrostatic transmissions.

Re: 20W-50 for a hydraulic pump in a hydrostatic trans [Re: ford46guy] #4107160 05/26/16 11:50 AM
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ford46guy Offline OP
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5W may be good for winter, this is a summer tractor.

Guess M1 or synth 15W-50 or 20W50 will be fine. The mystery fluid is supposedly synth, and this unit has a pulley fan and runs hot.

Whatever is cheaper at the Wally.


95 Tbird V8 240K PP SYNTH ULTRA 5W30
98 MGM 160K M1 HM 5W20
96 Explorer EB V6 159K PP SYNTH HM 5W30
95 Conti 155K MC 5W20
11 GS350 90K PP HM 5W30
Re: 20W-50 for a hydraulic pump in a hydrostatic trans [Re: ford46guy] #4107192 05/26/16 12:33 PM
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kschachn Offline
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Originally Posted By: ford46guy
5W may be good for winter, this is a summer tractor.


How would that make a difference?


1994 BMW 530i, 246K
1996 Honda Accord, 280K
1999 Toyota Sienna, 420K
2000 Toyota ECHO, 281K
Re: 20W-50 for a hydraulic pump in a hydrostatic trans [Re: kschachn] #4107198 05/26/16 12:43 PM
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ford46guy Offline OP
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Will it have protection if it starts up in 90 deg? Or the oil will be too thin?


95 Tbird V8 240K PP SYNTH ULTRA 5W30
98 MGM 160K M1 HM 5W20
96 Explorer EB V6 159K PP SYNTH HM 5W30
95 Conti 155K MC 5W20
11 GS350 90K PP HM 5W30
Re: 20W-50 for a hydraulic pump in a hydrostatic trans [Re: ford46guy] #4107214 05/26/16 01:08 PM
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kschachn Offline
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No, at that temperature (pretty much anything above 50 degrees) the viscosity of the three oils is going to be very similar. Nothing is really known about the 20W-50 but between the Mobil 1 oils it is very close.


1994 BMW 530i, 246K
1996 Honda Accord, 280K
1999 Toyota Sienna, 420K
2000 Toyota ECHO, 281K
Re: 20W-50 for a hydraulic pump in a hydrostatic trans [Re: ford46guy] #4107775 05/27/16 06:41 AM
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zeng Offline
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Originally Posted By: ford46guy
Originally Posted By: Oldmoparguy1
Isn't that the unit that many are using M1 15W-50?
That or 20W50. Some guy updates that his is running great for years.


You already had the proper selection. blush

Re: 20W-50 for a hydraulic pump in a hydrostatic trans [Re: ford46guy] #4114204 06/03/16 12:29 PM
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ford46guy Offline OP
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Went with M1 20W50 VTwin, was 2 bucks off a qt at the Zone over memorial day(Motorcycle season?). I also ran it by a volume small engine shop when I bought my bolts, they said they offer it as an $30 option for extreme use. Otherwise they use conventional store brand 20W50. He said in that unit it is likely lifetime.

Mower is about 20% faster with the new oil. I have a distance that I benchmarked. Case was hot enough to be hard to touch after mowing for an hour, now it is luke warm.

Took 1 qt + about 12 oz. Rest goes in my lube can. Nice thick oil.

Other side got 80W90 VV durablend synth (had some left over, took about 20 oz).

Last edited by ford46guy; 06/03/16 12:32 PM.

95 Tbird V8 240K PP SYNTH ULTRA 5W30
98 MGM 160K M1 HM 5W20
96 Explorer EB V6 159K PP SYNTH HM 5W30
95 Conti 155K MC 5W20
11 GS350 90K PP HM 5W30
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