Has anyone ever shimmed your hydrostatic relief valve?

[jinman]

Can anyone fill me in on what charge pump cavitation is?

Since I brought it up, I can tell you that it happens when a pump is being forced to rotate faster than the pumped fluid can flow. The pump pushes all the fluid out, but can't suck hard enough to get the inlet fluid to flow because of the cold viscosity of the fluid. It just can't flow fast enough. Therefore voids are developed at the pumps impellers and may cause erosion as J_J mentioned. Many HSTs have charge pumps that supply positive pressure to the HST pump to ensure it does not also cavitate. This allows the HST to operate efficiently throughout a range of temperatures. Some HSTs don't have charge pumps and only the HST pump is there to draw fluid from the reservoir. When a pump pushes out fluid but can't replace it with inlet fluid, there is cavitation. This explanation is probably way oversimplified, but it gives you an idea of why your transmission works better when the fluid becomes warm. By selecting a fluid that has a lower viscosity, you can prevent this problem. You either pay for the expensive fluid or wait for your tractor to warm up.

 

[gsdavis1]

Can I leave this winter fluid in all year round. I would hate to have to change fluid every 6 months. I really don't put that many hours on it.

Greg

 

[gsdavis1]

I do have quite a bit of 5w40 synthetic motor oil here at the house. I use it in my diesel truck for better winter performance.

I wonder if I can use that in my tractor hydrostat. I have a Terramite tractor and they say to ONLY use motor oil in the tranny and NOT hydraulic oil. They call for 15w40 oil.

 

[SPYDERLK]

I do have quite a bit of 5w40 synthetic motor oil here at the house. I use it in my diesel truck for better winter performance.

I wonder if I can use that in my tractor hydrostat. I have a Terramite tractor and they say to ONLY use motor oil in the tranny and NOT hydraulic oil. They call for 15w40 oil.

Use the 5w40. It will be good year round.
larry

 

[tommu56]

I'd check and clean your suction strainer and check the oil for water too.

were are you (how hot / cold will it get)

I'm not familiar with Terramite but I thought most hydro's used utf or better in the system.

Terramite by TerraQuip


[FONT=Arial, Helvetica][FONT=Arial, Helvetica, sans-serif]Description[/FONT] [/FONT]
[FONT=Arial, Helvetica][FONT=Arial, Helvetica, sans-serif]Above 32 degrees f.[/FONT] [/FONT]
[FONT=Arial, Helvetica][FONT=Arial, Helvetica, sans-serif]Below 32 degrees f.[/FONT] [/FONT]
[FONT=Arial, Helvetica][FONT=Arial, Helvetica, sans-serif]Oil Type[/FONT] [/FONT]
[FONT=Arial, Helvetica][FONT=Arial, Helvetica, sans-serif]15-W40[/FONT] [/FONT]
[FONT=Arial, Helvetica][FONT=Arial, Helvetica, sans-serif]10 weight[/FONT] [/FONT]
[FONT=Arial, Helvetica][FONT=Arial, Helvetica, sans-serif]Hydraulic System Filter Types[/FONT] [/FONT]

[FONT=Arial, Helvetica, sans-serif]Terramite P/N 2-200.2C [/FONT]​

[FONT=Arial, Helvetica] [FONT=Arial, Helvetica, sans-serif] Napa P/N 1551[/FONT] [/FONT]
[FONT=Arial, Helvetica] [FONT=Arial, Helvetica, sans-serif] Parker P/N 92199[/FONT] [/FONT]
[FONT=Arial, Helvetica] [FONT=Arial, Helvetica, sans-serif] AC - PF16[/FONT] [/FONT]
[FONT=Arial, Helvetica] [FONT=Arial, Helvetica, sans-serif] Fram P/N P-1653[/FONT] [/FONT]
[FONT=Arial, Helvetica] [FONT=Arial, Helvetica, sans-serif] Baldwin P/N B-958[/FONT] [/FONT]
[FONT=Arial, Helvetica][FONT=Arial, Helvetica, sans-serif]Hydraulic Oil Change Intervals[/FONT] [/FONT]
[FONT=Arial, Helvetica][FONT=Arial, Helvetica, sans-serif]1st change @ 50 hours; then every 300 hours[/FONT] [/FONT]
[FONT=Arial, Helvetica][FONT=Arial, Helvetica, sans-serif]Hydraulic Oil Capacity[/FONT] [/FONT]
[FONT=Arial, Helvetica][FONT=Arial, Helvetica, sans-serif]7 gallons on complete system; 4.7 gallon tank capacity[/FONT] [/FONT]
[FONT=Arial, Helvetica][FONT=Arial, Helvetica, sans-serif]Sump Strainer[/FONT] [/FONT]
[FONT=Arial, Helvetica][FONT=Arial, Helvetica, sans-serif]EZ-Flow P/N 6942. Clean strainer in solvent and re-use. Replace only if screen is damaged[/FONT] [/FONT]
[FONT=Arial, Helvetica, sans-serif]NOTE: Retract all cylinders when checking hydraulic oil levels. [/FONT]

 

[gsdavis1]

It can get 0 degrees in winter and up to high nineties in summer. I live in northeast ohio.

Greg

 

[gsdavis1]

What do you all think of using standard automatic transmission fluid. The red color would be nice for noticing a leak. And the tranny in my car and truck perform well in the cold.

Greg

 

[J_J]

What do you all think of using standard automatic transmission fluid. The red color would be nice for noticing a leak. And the tranny in my car and truck perform well in the cold.

Greg

There is probably something in your manual about which fluid to use in cold weather.

Speaking of ATF. I lot of manufactures use ATF in their products, Case products I know uses it.

 

[wdchyd]

I'd check and clean your suction strainer and check the oil for water too.

were are you (how hot / cold will it get)

I'm not familiar with Terramite but I thought most hydro's used utf or better in the system.

Terramite by TerraQuip


[FONT=Arial, Helvetica][FONT=Arial, Helvetica, sans-serif]Description[/FONT] [/FONT]
[FONT=Arial, Helvetica][FONT=Arial, Helvetica, sans-serif]Above 32 degrees f.[/FONT] [/FONT]
[FONT=Arial, Helvetica][FONT=Arial, Helvetica, sans-serif]Below 32 degrees f.[/FONT] [/FONT]
[FONT=Arial, Helvetica][FONT=Arial, Helvetica, sans-serif]Oil Type[/FONT] [/FONT]
[FONT=Arial, Helvetica][FONT=Arial, Helvetica, sans-serif]15-W40[/FONT] [/FONT]
[FONT=Arial, Helvetica][FONT=Arial, Helvetica, sans-serif]10 weight[/FONT] [/FONT]
[FONT=Arial, Helvetica][FONT=Arial, Helvetica, sans-serif]Hydraulic System Filter Types[/FONT] [/FONT]

[FONT=Arial, Helvetica, sans-serif]Terramite P/N 2-200.2C [/FONT]​

[FONT=Arial, Helvetica] [FONT=Arial, Helvetica, sans-serif] Napa P/N 1551[/FONT] [/FONT]
[FONT=Arial, Helvetica] [FONT=Arial, Helvetica, sans-serif] Parker P/N 92199[/FONT] [/FONT]
[FONT=Arial, Helvetica] [FONT=Arial, Helvetica, sans-serif] AC - PF16[/FONT] [/FONT]
[FONT=Arial, Helvetica] [FONT=Arial, Helvetica, sans-serif] Fram P/N P-1653[/FONT] [/FONT]
[FONT=Arial, Helvetica] [FONT=Arial, Helvetica, sans-serif] Baldwin P/N B-958[/FONT] [/FONT]
[FONT=Arial, Helvetica][FONT=Arial, Helvetica, sans-serif]Hydraulic Oil Change Intervals[/FONT] [/FONT]
[FONT=Arial, Helvetica][FONT=Arial, Helvetica, sans-serif]1st change @ 50 hours; then every 300 hours[/FONT] [/FONT]
[FONT=Arial, Helvetica][FONT=Arial, Helvetica, sans-serif]Hydraulic Oil Capacity[/FONT] [/FONT]
[FONT=Arial, Helvetica][FONT=Arial, Helvetica, sans-serif]7 gallons on complete system; 4.7 gallon tank capacity[/FONT] [/FONT]
[FONT=Arial, Helvetica][FONT=Arial, Helvetica, sans-serif]Sump Strainer[/FONT] [/FONT]
[FONT=Arial, Helvetica][FONT=Arial, Helvetica, sans-serif]EZ-Flow P/N 6942. Clean strainer in solvent and re-use. Replace only if screen is damaged[/FONT] [/FONT]
[FONT=Arial, Helvetica, sans-serif]NOTE: Retract all cylinders when checking hydraulic oil levels. [/FONT]

Terramite says: 10 weight for 32 deg or below........

Same as AW-32, or Mobil DTE24........pretty standard stuff.....these Eaton Hydrotransmissions can use that year round ........

If you have motor oil in it now then that explains the cavitation......unless it's real hot running and environment, I'd use 10w (AW-32) year round.......

:2cents:

 

[jinman]

What do you all think of using standard automatic transmission fluid. The red color would be nice for noticing a leak. And the tranny in my car and truck perform well in the cold.

Greg

I would not put ATF into an HST if it was not spec'd by the manufacturer. There are lots of ATFs and you never know what problems you might encounter from their special formulations. A 5w40 oil and a 15w40 oil work exactly the same in summer. The difference is the 5w40 will maintain a low viscosity at colder temperatures. The "40" says they lubricate the same at operating temperatures. If you need lower viscosity and quicker low temperature operation, and since the manufacturer recommends multi-viscosity motor oil, I'd sure go with the 5w40 and stay far away from all other fluids.