YANMAR HYDRAULIC FILTER SERVICE
INTERVAL - 250 HOURS/EVERY YEAR
TIME REQUIRED -20 MINUTES
Yanmar uses 1 reservoir for both the hydraulic oil
and the transmission oil. This oil is a Hydraulic Transmission oil.
Never use a simple Hydraulic oil.
 The
hydraulic pump on all yanmar tractors is very simple. It is basically
two gears running together at high speeds to move the oil. These
gears must have extremely tight tolerences in order for this to
work. Because of these tight tolerences, and dirt or debris will
almost always destroy a pump.
Because of this, it is important that your oil be
clean and your filter or screen be serviced periodically. Not all
Yanmar tractors have hydraulic filters. In fact only the '20 series,
'02 series, some of the F and Fx series gray market, and some of
the US versions have a spin on filter. Most have small tubular screens
inside the transmission housing that filter the oil.
If your tractor has a spin on filter, replacement
is a breeze.
1 - Be sure that you have a replacement filter on
hand. These are not filters that you will find at a local parts
store. Please check our sponsors for a replacement hydraulic
filters.
2 - Using a filter wrench or channel lock plyers,
remove the oil filter. As the oil is draining out of the filter
housing, remove the drain plug. This is located just below the rear
axles. There may be two or more plugs that you will need to remove
in order to get all of the oil drained. Use a large drain pan as
it may hold many gallons.
3- If your tractor has the screen type filter, after
the oil has drained, locate the screen. The screen will always be
in the transmission housing. It will usually be on the directly
on the opposite side of the large hydraulic suction line that goes
into the right (sitting on the seat) side of the transmission. You
will need to remove a 2-4 bolt plate that holds this filter in.
The filter may also be directly behind the large suction line. To
remove this filter you will need to remove the rubber hose connection
thatcouples the two sections of steel hyd line together. Then remove
the 3-4 bolt plate where the line goes into the transmission. The
screen will be behind that plate. If the screen is in none of these
places, it will be behind a 2-3 bolt plate at the very botton of
the transmission. Refer to your parts manual or operation manual
for exact location.
4 - Clean the screen with a carburator cleaner or
fresh diesel.
5 - Re-install screen and cover. Re-fill with the
correct amount of Hydraulic Transmission oil. Never use a simple
Hydraulic oil. Check periodically with the dipstick or check your
Yanmar operation manual
for your tractor.
6 - Start tractor and check for leaks.
BE SURE TO CHECK OUT OUR SPONSORS FOR REPLACEMENT
PARTS.
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