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15w60 full synth in Hydro Gear PG pumps & motors #4145569
07/07/16 04:42 PM
07/07/16 04:42 PM
Joined: Jul 2016
Posts: 1
New South Wales, Australia
redeye Offline OP
redeye  Offline OP

Joined: Jul 2016
Posts: 1
New South Wales, Australia
my gravely compact pro 34 has hydro gear 10cc pumps & motors. Its due for its 1st oil change - I have some 15w60 full synthetic (Penrite HPR15) and wonder if it would be safe to use? It would currently have 20w50 dinosaur oil in it and I would be draining from the filter so it won't be a 100% removal....is it ok for synth & dino to be mixed?

Re: 15w60 full synth in Hydro Gear PG pumps & motors [Re: redeye] #4150488
07/13/16 10:36 PM
07/13/16 10:36 PM
Joined: Nov 2009
Posts: 5,220
Houston, Texas
motor_oil_madman Offline
motor_oil_madman  Offline

Joined: Nov 2009
Posts: 5,220
Houston, Texas
The dino syth mix doesn't matter and hasn't been an issue since the 70's. It probably wouldn't matter, but why not just use either 15w50 or 20w50 like recommended? I'm not sure how cold it gets in Australia, probably not very, but I know on my gravely it takes a few minutes for the hydros to warm up and loosen up so to speak. It's hard for me to explain.


2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.

Re: 15w60 full synth in Hydro Gear PG pumps & motors [Re: redeye] #4395942
05/04/17 05:24 AM
05/04/17 05:24 AM
Joined: Oct 2014
Posts: 778
Pa, USA
NH73 Offline
NH73  Offline

Joined: Oct 2014
Posts: 778
Pa, USA
Hydro Gear has a min. viscosity but not a maximum. So yes, it should work. If its what I think it is, most of fluid do drain out.


2017 Toyota RAV4 Hybrid
2004 Ford Explorer Sport Trac
2012 Gravely ZT XL 48 w/ Kawasaki FR730
Re: 15w60 full synth in Hydro Gear PG pumps & motors [Re: redeye] #4395958
05/04/17 05:57 AM
05/04/17 05:57 AM
Joined: Nov 2003
Posts: 1,336
Middle of Iowa
DriveHard Offline
DriveHard  Offline

Joined: Nov 2003
Posts: 1,336
Middle of Iowa
Why not use an ISO 68 hydraulic fluid? It would perform better in this application. Engine oil is only specified because it is easier to obtain.

Last edited by DriveHard; 05/04/17 05:57 AM.

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Re: 15w60 full synth in Hydro Gear PG pumps & motors [Re: DriveHard] #4410180
05/21/17 08:15 AM
05/21/17 08:15 AM
Joined: Nov 2009
Posts: 5,220
Houston, Texas
motor_oil_madman Offline
motor_oil_madman  Offline

Joined: Nov 2009
Posts: 5,220
Houston, Texas
Originally Posted By: DriveHard
Why not use an ISO 68 hydraulic fluid? It would perform better in this application. Engine oil is only specified because it is easier to obtain.


Says not to use hydraulic fluid, but is this because people might use the wrong kind? Looks like their is three different thicknesses, iso68 being the thickest.


2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.

Re: 15w60 full synth in Hydro Gear PG pumps & motors [Re: redeye] #4410470
05/21/17 01:25 PM
05/21/17 01:25 PM
Joined: Feb 2009
Posts: 3,653
down in the park
Jetronic Offline
Jetronic  Offline

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Posts: 3,653
down in the park
I suppose you need hydraulic fluid with zinc, ashless exists aswell but if the system required that they wouldn't recommend engine oil.


AR Giulietta 2.0 JTDM-2 -- Total Quartz 9000 Energy 0w30
Hankook Ventus Prime 2 215/50R17 (front)
Pirelli P7 Cinturato 225/45R17 (rear)
Re: 15w60 full synth in Hydro Gear PG pumps & motors [Re: Jetronic] #4410969
05/21/17 10:54 PM
05/21/17 10:54 PM
Joined: Nov 2009
Posts: 5,220
Houston, Texas
motor_oil_madman Offline
motor_oil_madman  Offline

Joined: Nov 2009
Posts: 5,220
Houston, Texas
Originally Posted By: Jetronic
I suppose you need hydraulic fluid with zinc, ashless exists aswell but if the system required that they wouldn't recommend engine oil.


There is a guy on youtube that repairs these. He said the guy brought the mower in and used hydraulic fluid. The machine wouldn't even move forward hardly. Maybe he used the wrong grade of hydraulic fluid?

Last edited by motor_oil_madman; 05/21/17 10:57 PM.

2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.

Re: 15w60 full synth in Hydro Gear PG pumps & motors [Re: redeye] #4411337
05/22/17 12:50 PM
05/22/17 12:50 PM
Joined: Feb 2009
Posts: 3,653
down in the park
Jetronic Offline
Jetronic  Offline

Joined: Feb 2009
Posts: 3,653
down in the park
The only reason I can think of that the machine won't move, is because the pump is worn and can't pressurise properly with thinner oil. I'd also look into stick/slip action when lightly loaded, riction modiiers might be needed?

You're using 20w50 now, why change?


AR Giulietta 2.0 JTDM-2 -- Total Quartz 9000 Energy 0w30
Hankook Ventus Prime 2 215/50R17 (front)
Pirelli P7 Cinturato 225/45R17 (rear)
Re: 15w60 full synth in Hydro Gear PG pumps & motors [Re: redeye] #4411574
05/22/17 06:26 PM
05/22/17 06:26 PM
Joined: Nov 2009
Posts: 5,220
Houston, Texas
motor_oil_madman Offline
motor_oil_madman  Offline

Joined: Nov 2009
Posts: 5,220
Houston, Texas
I use mobil 1 15w50. Says you can use either. Just wondering why a hydraulic system calls for motor oil, why not use hydraulic fluid like normal.

Or is a hydro gear pump and wheel motor not a true hydraulic system?


2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.

Re: 15w60 full synth in Hydro Gear PG pumps & motors [Re: motor_oil_madman] #4465871
07/21/17 08:23 AM
07/21/17 08:23 AM
Joined: Nov 2003
Posts: 1,336
Middle of Iowa
DriveHard Offline
DriveHard  Offline

Joined: Nov 2003
Posts: 1,336
Middle of Iowa
Originally Posted By: motor_oil_madman
Originally Posted By: DriveHard
Why not use an ISO 68 hydraulic fluid? It would perform better in this application. Engine oil is only specified because it is easier to obtain.


Says not to use hydraulic fluid, but is this because people might use the wrong kind? Looks like their is three different thicknesses, iso68 being the thickest.


Yup, they specify engine oil because it is easy to get, and there is a higher chance people will choose the correct viscosity. I will say that an SAE crankcase oil of weight 50 is a THICK hydraulic fluid and might be hard to find...I think it is equal to an ISO 150 or 220 grade hydraulic fluid. If it was my machine I would be running the ISO 220 hydraulic fluid.

UNLESS you run it in the winter...then you might want to stick with the multi-grade oil.


Smile, it increases your face value
2013 Fiat 500 Abarth mod heavy (my DD)
2018 Alfa Romeo Stelvio TI Sport (wife's)
2011 Silverado Crew Cab LT 6.2L/6spd (tow pig)
2007 Nissan Xterra (trail toy)
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