Hydraulic fluid change, cylinder drain/bleeding? B21

   / Hydraulic fluid change, cylinder drain/bleeding? B21 #1  
J

joea99

Platinum Member
Joined
Sep 8, 2014
Messages
580
Location
Marbletown NY
Tractor
Kubota B21, JD 240GT
Having just resealed a couple cylinders, am about to drain fluid and replace filters.

No doubt this has been covered many times. If so, just point me to the right place. "Friendly local Kubota dealer" does not count. Transport being the obvious reason. Being a cheap so and so is the other.

For the filter change, I was going to "pre charge" the filters as I do when changing engine oil as it cuts down the time engine is running with no oil. That is, pour oil into the filter till it does not soak up any more, then invert to drain excess since most engine filters install holes down or to the side.

The work shop manual does not mention draining the cylinders, but that seems prudent to me, so as to not mix old with new. So, is it a good idea? If so, I fully expect some air lock at some point, some where. The manual mentions bleeding, but has no examples.
 
   / Hydraulic fluid change, cylinder drain/bleeding? B21 #2  
If you don't mind putting the extra effort into draining all the cylinders, no problem... Most just consider the percent of residual old oil as compared to the complete system, as being too insignificant to justify the time and effort...
as for bleeding the air, when you activate any hydraulic circuit the oil will flow in and displace the air shoving it out and eventually into the main tank where it will vent. so no problem with air. KennyV
 
   / Hydraulic fluid change, cylinder drain/bleeding? B21
  • Thread Starter
#3  
Managed to get them resealed, (or packed if you prefer), fluid and filters changed. Gave me a scare when I fired it up and had no hydraulics at all. After a few top offs and restarts, decided I was babying it and got the revs up to normal, then heard "something" happen and the hydraulics began working.

A plus - nothing is leaking. So far.
 
   / Hydraulic fluid change, cylinder drain/bleeding? B21 #4  
You drained the axle housing bungs as well?
 
   / Hydraulic fluid change, cylinder drain/bleeding? B21
  • Thread Starter
#5  
100 td said:
You drained the axle housing bungs as well?
Click to expand...

There were 3 drain plugs for the hydraulic/HST fluid change. The front I just drained and refilled with gear oil from Walmart. That looked like it had never been changed.
 
   / Hydraulic fluid change, cylinder drain/bleeding? B21 #6  
Yeah, I meant the rear axle bungs, sounds like you got them.
 
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