Shop Vac Suction at Hydraulic Fill Port?

Ddh1961

Member
Joined
Nov 27, 2020
Messages
28
Location
Gulf Coast, AL
Tractor
LS MT225E
Okay! I tried this suction trick with the assistance of my father-in-law yesterday! The good news is my 350 hour old hydraulic fluid looked great. I paid about $900 to my dealer for the 50 hour service, which is everything gets changed. It was a very light brown - looked like new engine oil. Guess those filters work pretty well! And as far as any "shearing of the molecules" might go from time in service usage or heating that could reduce its effectiveness, let me attest that stuff is slippery!

I know the hydraulic fluid color because it got all over the place.

To start my hydraulic fluid filter journey of discovery I took out the shop vac bag and the conical pleated filter. Put the shop vac on a step ladder on top of the bush hog to elevate it and used bungie cord to secure it . FIL (Ha! Father in Law, changing FILters, too bad his name isn't Phil) ensured the shop vac hose stayed put and also held the hose up so any fluid that might get sucked into it would have a lot of gravity to overcome to get into the shop vac. The shop vac hose fit perfectly into the hydraulic fluid fill port, and he didn't think it cracked the seal during my ensuing flail-ex, so he concluded in the future it would not need attending. Because it apparently fit so well I didn't use a funnel or duct tape.

I put a finger wipe of fresh oil on the rubber gaskets of both filters. Loosened the big system filter just a tad, then FIL started the shop vac. With suction going I began spinning off the filter. Before it was unthreaded it started dripping some around the edges and suddenly my hand was coated with fluid and super slippery. I did not think this through and have a basin of some kind to lay the old filter in so I just put it down on my concrete shop floor. Now fluid is dripping pretty good out of the filter attachment point - the shop vac is not holding it all back. I tried to pick up the new filter but it squirted away towards the bush hog and FIL. I yelled for him to kick it back towards me, which he did. Then somehow with my oil coated hand I picked it up (it is pretty wide) and spun it on. About two quarts lost.

The hydrostatic transmission filter I noted from print on its side is supposed to be changed every 200 hours. Well, okay, so that went 350 hours too. With the shop vac going it lost very little fluid - maybe half a cup.

Did the suction trick work? I'm convinced it helped. I think without it holding back full flow during my keystone cop routine under the tractor instead of two quarts I'd probably have lost two of the eleven gallons.

My progress towards "Country Man Certification" took one step forward for attempting this, but unfortunately two steps backwards for the preventable buffoonery I demonstrated!

Rhino
Great story, thanks for sharing! 👍
 

Captain Dirty

Gold Member
Joined
Jun 29, 2016
Messages
406
Location
Eastern Mass
Tractor
Goldoni 600, Kubota L45
Mercifully, your bath was short. I wonder if any vent/breather cap on the hydraulic fluid reservoir were open. On my Kubota the vent is on the fill cap so removal of the cap to place the vacuum ensures no venting; I don't know about the Kioti. When I cracked the filters with the vac running I heard gurgling as the only way air could enter the system was through the loosened threads on the filter. You are excused if, in your frustration, you were not listening; perhaps your FIL heard.
 

jonsstihl

Platinum Member
Joined
Sep 2, 2008
Messages
598
Location
Quebec, Canada
i was under the impression the HST filter was the only one to get replaced at 200 hrs the main suction filter has a 400 hr replacement interval same time as the fluid. I think??

Maybe that is why the HST filter only dribble a bit and the main filter leaked a lot.
 
  
  • Thread Starter
#34  
OP
R

Rhino35

Bronze Member
Joined
May 28, 2013
Messages
75
Location
Independence, KY
Tractor
Kioti DK 40 SE Hydro
i was under the impression the HST filter was the only one to get replaced at 200 hrs the main suction filter has a 400 hr replacement interval same time as the fluid. I think??

Maybe that is why the HST filter only dribble a bit and the main filter leaked a lot.
I think you're correct, James.
 
  
  • Thread Starter
#35  
OP
R

Rhino35

Bronze Member
Joined
May 28, 2013
Messages
75
Location
Independence, KY
Tractor
Kioti DK 40 SE Hydro
Mercifully, your bath was short. I wonder if any vent/breather cap on the hydraulic fluid reservoir were open. On my Kubota the vent is on the fill cap so removal of the cap to place the vacuum ensures no venting; I don't know about the Kioti. When I cracked the filters with the vac running I heard gurgling as the only way air could enter the system was through the loosened threads on the filter. You are excused if, in your frustration, you were not listening; perhaps your FIL heard.
Does anyone know if there is a separate vent/breather on a Kioti DK40 SE? The fill cap is rubber and solid.
 
 
Top