34
HYDRAULIC SYSTEM MAINTENANCE
REPLACING HYDRAULIC OIL FILTER
The hydraulic oil filter keeps the hydraulic system
relatively free of contaminants and must be serviced at
regular intervals. Initially, change filter after first ten
hours of engine operation, and thereafter, after
every 200 hours of operation or yearly, whichever
comes first. Use TORO oil filter, Part No. 23–9740, as a
replacement.
1.
Clean area where hydraulic oil filter mounts.
Remove filter from base (Fig. 49) and clean filter
mounting surface.
1
Figure 49
1. Hydraulic oil filter
2.
Lubricate filter gasket with proper viscosity and type
oil. Then fill filter using the same oil.
3.
Install filter by hand until gasket contacts mounting
head. Then rotate an additional 1/2 turn.
4.
Start engine and check for hydraulic oil leaks. Allow
engine to run for about two minutes so any air in the
system is purged (removed).
5.
Shut engine off and check level of hydraulic system;
refer to Check Hydraulic System Oil.
CHANGING HYDRAULIC SYSTEM OIL
The hydraulic system oil must be changed after every
1000 hours of operation or seasonally, whichever
comes first. The hydraulic system is designed to
operate on any high quality detergent oil having the
American Petroleum Institute—APO—“service
classification” SF/CC or CD. Oil
viscosity—weight—must be selected according to
anticipated ambient temperature for the season in
which product will be used.
Temperature/viscosity recommendations are:
Expected
Ambient
Temperature
Recommended
Viscosity
and Type
(Extreme) over 90
F
SAE 30, Type SF/CC or
CD engine oil.
(Normal) 40
-100
F
SAE 10W-30 or 10W-
40, Type SF/CC or CD
engine oil.
(Cool—Spring/Fall)
30
-50
F
SAE 5W-30, Type
SF/CC or CD engine oil.
(Winter) Below 30
F
Type “F” or “FA” ATF
Automatic Transmission
Fluid.
Note: Do not mix engine oil and automatic transmission
fluid or hydraulic system component damage may
result. When changing fluids, also change transmission
filter. DO NOT USE DEXRON II ATF.
Note: Fluid to operate the power steering is supplied by
the hydraulic system transmission charge pump. Cold
weather start–up may result in “stiff” operation of the
steering until the hydraulic system has warmed up.
Using proper weight hydraulic oil in system minimizes
this condition.
The axle housing acts as the reservoir for the system.
The transmission and axle housing are shipped from the
factory with approximately 5 quarts (4.7 L) of SAE
10W-30 engine oil. However, check level of
transmission oil before engine is first started and daily
thereafter.
1.
Start engine, park machine on a level surface, lower
implement to the shop floor, set the parking brake, and
shut engine off. Block the two rear wheels.
2.
Jack up both sides of front axle and support it with
jack stands.
3.
Clean area around hydraulic oil filter and remove
filter.
4.
Remove drain plug from fitting between axle
housing and oil filter and allow oil to flow into drain pan
(Fig. 50).
5.
Install new filter; refer to steps 1-2 in Replacing
Hydraulic Oil Filter, for proper procedures.
6.
Install drain plug in fitting between axle housing and
oil filter (Fig. 50).
7.
Remove dipstick from axle filler tube (Fig. 51) and
fill axle to proper level with correct type and viscosity oil
recommended for expected ambient temperature
conditions; refer to table above.
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