Oil & Fuel Bypass oil filter for those that care

[smartguyz]

OK guys, I am a complete noob at this. What size hoses and quick connects would I need to purchase from Surplus Center? Anybody have a link for me? Thank you kindly.

-Rob

 

[Bob999]

Bob, you said the same thing I did about the fluid flow, except that your fluid from the case drains goes directly to tank. All four wheel motors collect at a common manifold and one line goes to the pump case, then the fluid from the pump case is routed back to the radiator, cooled, and sent to reservoir.

I thought I said a couple of things different:
1. You said only 5% of the oil flow is filtered. I said all oil going to the charge pump is filtered.
2. I said (based on the diagram provided with my 1845) that the case drains from the wheel motors return to the tank.
3. You said that sometimes it is not drawing very much fluid from the tank while my understanding is that the charge pump pumping rate is several gallons per minute.

 

[Bob999]

OK guys, I am a complete noob at this. What size hoses and quick connects would I need to purchase from Surplus Center? Anybody have a link for me? Thank you kindly.

-Rob

The port sizes for the filter are listed (SAE 12). You would have to check the port on the motor of the mower to see what size fitting is required there and order a short hose with SAE 12 male on one end and a male fitting to fit your motor port on the other. The other connection would be an adaptor from the SAE 12 male to (probably) a female to fit the existing hose that attaches to your motor.

 

[smartguyz]

Looks to me like the max operating pressure is 3000 PSI, and burst pressure is 8600 PSI.

If I understand this properly, if there is more than 50PSI differential pressure (i.e. resistance to flow) in the filter media, then the filter head will bypass.

I dunno, but this still sounds to me like it will work....

-Rob

 

[smartguyz]

The port sizes for the filter are listed (SAE 12). You would have to check the port on the motor of the mower to see what size fitting is required there and order a short hose with SAE 12 male on one end and a male fitting to fit your motor port on the other. The other connection would be an adaptor from the SAE 12 male to (probably) a female to fit the existing hose that attaches to your motor.

Thanks Bob999, but I am looking to do what JJ suggested - having something with quick connects on both ends, so it could either be placed into the circuit when no motor is being used, or spliced into the circuit when using a motored device.

Therefore, I think I'll need something with male SAE12 fittings on one side of the hose, and a male QC that goes to the PTO, and then a male SAE12 fitting to a female PTO QC. Does that sound right?

-Rob

 

[Bob999]

Thanks Bob999, but I am looking to do what JJ suggested - having something with quick connects on both ends, so it could either be placed into the circuit when no motor is being used, or spliced into the circuit when using a motored device.

Therefore, I think I'll need something with male SAE12 fittings on one side of the hose, and a male QC that goes to the PTO, and then a male SAE12 fitting to a female PTO QC. Does that sound right?

-Rob

You can do that. The downside is that QCs are a point of restriction and with your approach you will have 3 pairs in the loop when you have an attachment. It also means you will need relatively short hoses on both sides of the filter and that may be difficult to mount when you are using an attachment on the PTO circuit.

Personally I don't think the additional filtration is needed 100% of the time--in my view it is debatable whether it is needed at all. Granted I did install the extra filter so it is a little ackward for me to argue agains your plan but I haven't read about failures from those who have far more hours and the stock arrangement.

 

[Gravy]

I believe this would be the simplest and cheapest filter arrangement. When not using the PTO, insert a filter into the QD's, and flip the pump on. The fluid will be low pressure, because there is no restrictions in the path of fluid flow.

This is what I tried a few years ago using a Zinga spin-on filter setup from Surplus Center. The results were uncomfortable. Nothing blew out, but the pressures were only marginally acceptable with hot fluid at idle. We discussed it here: http://www.tractorbynet.com/forums/power-trac/77278-variable-speed-transmission-3.html

I really oughta get back to that project...

 

[J_J]

I thought I said a couple of things different:
1. You said only 5% of the oil flow is filtered. I said all oil going to the charge pump is filtered.
2. I said (based on the diagram provided with my 1845) that the case drains from the wheel motors return to the tank.
3. You said that sometimes it is not drawing very much fluid from the tank while my understanding is that the charge pump pumping rate is several gallons per minute.

Just to be clear, the charge pump will pump about 5 to 10 % of the VSP pump. So if the VSP pump will pump 40 GPM, then the charge pump will pump about 4 GPM, and the charge pressure is somewhere around 350 to 450 psi. And, I agree that all charge pump fluid is filtered.

Do you have separate hoses from the wheel motors and the pump case drain going back to the hyd radiator? There is another case drain line for any case drain hyd motor on the front of the 1445.

My 1445 is an early 90's model, and the VSP pump is built by Eaton.

 

[smartguyz]

You can do that. The downside is that QCs are a point of restriction and with your approach you will have 3 pairs in the loop when you have an attachment. It also means you will need relatively short hoses on both sides of the filter and that may be difficult to mount when you are using an attachment on the PTO circuit.

Personally I don't think the additional filtration is needed 100% of the time--in my view it is debatable whether it is needed at all. Granted I did install the extra filter so it is a little ackward for me to argue agains your plan but I haven't read about failures from those who have far more hours and the stock arrangement.

How about we create a setup with the high-pressure filter, and two short hoses with quick-connects. We use it only when not using a motor in the loop - e.g. when using buckets and forks, etc.

This becomes the ultra-simple aux filter setup. No extra pumps, no drilling into the housing for the supply tank, just extra filtering using the PTO circuit. I think it would provide a lot of peace of mind, and very little expense, very little extra to do, except to swap in your 'filter setup' when you're not using any motor-powered devices.

Could even fab up some kind of mount for the filter assembly on the arms.

Whuddathink?

-Rob

 

[Bob999]

How about we create a setup with the high-pressure filter, and two short hoses with quick-connects. We use it only when not using a motor in the loop - e.g. when using buckets and forks, etc.

This becomes the ultra-simple aux filter setup. No extra pumps, no drilling into the housing for the supply tank, just extra filtering using the PTO circuit. I think it would provide a lot of peace of mind, and very little expense, very little extra to do, except to swap in your 'filter setup' when you're not using any motor-powered devices.

Could even fab up some kind of mount for the filter assembly on the arms.

Whuddathink?

-Rob

Yes I think it would work but there is still the issue of where it goes when there is, for example, a bucket in front. I would be reluctant to simply have it dangle from QCs attached to hydraulic hose.

I chose putting it on the mower because more than half of my operating hours are using the mower, the mower is operated at relatively high engine speed giving high flow, and because the mower deck provided a simple place to mount the filter.