My mower just hit the 500 hr mark and the manual says time to change the hydraulic filter and oil. I have looked through the forum and read the manual. According to the manual it says to remove the oil filter and let the oil drain, then replace with a new filter and refill the resevoir. Seems simple enough however some old posts suggested lifting the rear wheels off the ground and going in forward/reverse several times to purge the air from the system. The manual does not says this. The manual also says it takes 4 quarts of oil but again reading in some of the older posts they say thats only if you drain the entire system and that only about 2 quarts will be needed to refill with the filter change. When I remove the filter I plan to fill the empty filter with new oil so as not to have air in the filter then screw it on, but would I still need to lift the rear wheels off the ground and purge the system and if so, do I need to open some type of valve or unscrew a line to let the air out?
copotay
500 hr Hydro Oil/Filter change 2005 Gravely 152Z
I went ahead and did it after speaking to the guys at the local dealer. Remove old filter, let drain, u will lose about a quart and a half. Screw new filter on after filling it with new oil so as not to create an air pocket. Fill to correct level. Run for about a half hour in forward for about 1/2 hour, recheck level, finish. They guys confirmed you will not drain all of the oil out of the system which takes 4 quarts. They also said it was my choice to run it with the wheels off the ground, they do it just to make sure no air entered the line, but following those directions will normally not allow air in the system. Also I had put a bit too much oil for the dipstick so I unscrewed the filter a little bit and allowed oil to drain down the filter until I hit the right level. Also nothing goes as planned, the chrome plated hydro dipstick under the seat began slipping on the plug so I could not unscrew the darn thing, I had to remove a brace plate beneath the seat to get at the plug beneath the chrome dipstick with a wrench. Then I was able to remove the dipstick. Lesson learned, don't overtighten the thing.
air will bleed out thru tank where you added oil , after you changed oil ,and with mower raised did you run with the hydro released or open, then close release then run again foward the reverse. main thing is to get air out of system!
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