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Old 04-04-2012, 09:29 PM   post #1 of 7
super m
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Default Locating a hydraulic filter

I have a dual 345 without a hydraulic filter I have been told to put it inline between the spool valve and the return to reservoir. It seems it would do more good on the outlet of the reservoir before the pto pump. Don't know if it will restrict flow to pump?
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Old 04-04-2012, 09:37 PM   post #2 of 7
wally2q
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Default Re: Locating a hydraulic filter

filter should be on the suction side of the pump....
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Old 04-04-2012, 09:44 PM   post #3 of 7
super m
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Default Re: Locating a hydraulic filter

Thanks I didn't think it made sense to filter the oil after it had been circulated local tractor parts store gave me the miss information
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Old 04-05-2012, 08:06 AM   post #4 of 7
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Default Re: Locating a hydraulic filter

I've always seen add-on filters on the return line back to the reservoir. I think that there's 2 reasons. First, you don't want to restrict the flow on the suction side of the pump, especially on a system that wasn't designed to have a filter in the first place. Second, the oil gets dirty when it's out in the system doing work, so cleaning it before it gets back to the reservoir keeps the rest of the reservoir from getting contaminated.
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Old 04-05-2012, 08:10 AM   post #5 of 7
wally2q
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Default Re: Locating a hydraulic filter

both good reasons, however, the oil reservoir may also already have debris in it - including debris that fell in during the act of adding oil for example.
My philosophy is that you don't want to send that debris throughout the entire hydraulic circuit, and only hope that it works its way through to the return line and into the filter.....

the return line may have very little pressure in it - in some instances, it's even relies on gravity flow. Adding the filter there may cause unexpected backpressure in the hydraulic system. This may or may not be a problem.

having said that, the filter has to be big enough to not restrict pump inlet flow rate. it should not be a small automotive filter.

best thing to do is google filter kits and see what the experts are doing....
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Old 04-05-2012, 08:30 AM   post #6 of 7
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Default Re: Locating a hydraulic filter

Quote:
Originally Posted by super m View Post
I have a dual 345 without a hydraulic filter I have been told to put it inline between the spool valve and the return to reservoir. It seems it would do more good on the outlet of the reservoir before the pto pump. Don't know if it will restrict flow to pump?
A good hydraulic system will have two filters. A finer filter on the return circuit (with a relief valve) and a coarser filter on the suction side of the pump. The suction filter is usually wire mesh and just stops the bigger debris and is reusable.
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Old 04-05-2012, 08:44 AM   post #7 of 7
jdemaris
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Default Re: Locating a hydraulic filter

Quote:
Originally Posted by super m View Post
I have a dual 345 without a hydraulic filter I have been told to put it inline between the spool valve and the return to reservoir. It seems it would do more good on the outlet of the reservoir before the pto pump. Don't know if it will restrict flow to pump?
Link to 25 GPM in-line suction filter - 25 micron with a 5 PSI bypass/relief. Cost $30 . .


http://www.surpluscenter.com/item.as...name=hydraulic

32 GPM suction filter - also 25 micron is $40 . .

http://www.surpluscenter.com/item.as...name=hydraulic

20 GPM return filter assembly with a 10 micron filter and bypass is $14 ..

http://www.surpluscenter.com/item.as...name=hydraulic
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Tractors: IH B275 (2), Case VAC,/VAC-14(2), Case DC (3) Ford 641, Shaw R12, MF35, Ferg TO35, Bolens Ridemaster, AC HD4/ HD6 dozer, Oliver HG dozer, Oliver OC46 crawler, Deere 300B TLB/ 1010 crawler, Ford 4000 TLB, Pettibone TLB, IH 3414 TLB
Garden tractors (over 100 ).
Chainsaws: Remington Mall (2), Sthil S10, 040, 041G, 045 Super, 051, 041 Super; Dolmar/Makita DCS510 and DCS6401, Echo(3), EFCO/Deere CS56 (3), Poulan Pro (4), Husqvarna 455, Hoe, Lombard 2 man, Homelites (over 20).
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