Do HST filters have Bypasses?

racerboy832 · Aug 22, 2010

I'm trying to match up filters for my Deutz Allis 5220 HST. Dealer wants $100 each for HST and Hydro filters. The HST filter from the dealer shows it as an element but it is a spin on. Wix # 51736 is a dead on copy of the filter I have from a measurement point. Only one I can find on the net with the nut on the back too. I looked inside the filter and don't see a bypass Valve but that doesn't mean there wasn't suppose to be one. Generally speaking do HST filters have a bypass or maybe there is one made into the mount. The 8" long Hydrofilter (Wix 57300) looks like there is one in the bottom of the one on the machine. The only thing i'm not sure about is what the Min Micron size I need and the bypass valve.

zman007007 · Aug 22, 2010

Since you have numbers and name brand , call someone else like Napa and see if they can cross them over for you. It will be a lot cheaper. zman:thumbsup:

sandman2234 · Aug 22, 2010

Before I spent $100 on a filter, that would need changing often, I would investigate plumbing in an aftermarker filter base and use a different filter, but a GOOD one. Maybe even add a pair inline of each other to protect the system even more, or at least plumb in an extra prior to the original, to extend the life and usefulness of the original. All of this will be conditional of available room, however.
David from jax

J_J · Aug 22, 2010

The bypass, is located in the filter housing. Some even have a gage, or other indicator to remind you to change. If you don't have the gage or other indicator, you may be bypassing and not know it.

http://www.tpub.com/content/engine/14105/css/14105_147.htm

racerboy832 · Aug 22, 2010

The thing that kinda throw me off is all the bypasses I have seen pop off at 11-20 PSI. If the HST Charge is suppose to run at 60-90 PSI to the Transmission pump wouldn't it always blow open the valve? I can see the Hydraulic Suction filter having a bypass like the one that came off it but it's this HST filter that i'm concerned about. I'm not trying to be cheap cause I want my tractor to last but $100 a filter just doesn't seem correct if they can even still get me the ones I need.

RickB · Aug 22, 2010

J_J said:
The bypass, is located in the filter housing. Some even have a gage, or other indicator to remind you to change. If you don't have the gage or other indicator, you may be bypassing and not know it.

Figure 9-11.—Full-flow bypass-type hydraulic filter (with contamination indicator).

Many spin on filters have a bypass valve within.

J_J · Aug 22, 2010

I have a hydrostatic transmission on my Power-Trac, and the suction filter is before the charge pump, and the bypass is in the housing.

racerboy832 · Aug 22, 2010

JJ, I think I misread your post. The Bypass is in the filter Base not in the filter on the HST side. That makes more sense. When I took both filters off ,the HST Filter is about 6" long with a Nut on the back and is yellow. The Suction Filter is about 8" Long and is just plain white. If I look in the filter opening at the bottom there is a metal piece sticking straight up and it wiggles. I assume this a bypass for the big filter.

The HST Filter says 2c10 on it. But that's all.

RickB · Aug 22, 2010

J_J said:
I have a hydrostatic transmission on my Power-Trac, and the suction filter is before the charge pump, and the bypass is in the housing.

I don't doubt that. But there are plenty of spin on filters in this world with bypass valves. Statements such as "The bypass, is located in the filter housing" need to be directed towards a particular application where it is valid, not spread like a blanket.