46
Replacing the Hydraulic Fluid
Filter
The hydraulic fluid 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 fluid filter mounts. Remove
filter from base (Fig. 71) and clean filter mounting
surface.
1
Figure 71
1. Hydraulic oil filter
2. Lubricate filter gasket with proper type of hydraulic
fluid. Then fill filter using the same hydraulic fluid.
3. Install filter by hand until gasket contacts mounting
head. Then rotate an additional 1/2 turn.
4. Start engine and check for hydraulic fluid 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 Checking the Hydraulic System Oil, page 25.
Changing the Hydraulic
System Fluid
The hydraulic system fluid must be changed after every
1000 hours of normal operation or every two years,
whichever comes first.
The recommended replacement fluid is:
Toro Premium Transmission/Hydraulic Tractor
Fluid
(Available in 5 gallon pails or 55 gallon drums. See
parts catalog or Toro distributor for part numbers.)
Alternate fluids: If the Toro fluid is not available, other
petroleum–based Universal Tractor Hydraulic Fluids
(UTHF) may be used provided its specifications fall within
the listed range for all the following material properties and
it meets industry standards. We do not recommend the use
of synthetic fluid. Consult with your lubricant distributor to
identify a satisfactory product Note: Toro will not assume
responsibility for damage caused by improper substitutions,
so use only products from reputable manufacturers who
will stand behind their recommendation.
Material Properties:
Viscosity, ASTM D445 cSt @ 40_C 55 to 62
cSt @ 100_C 9.1 to 9.8
Viscosity Index ASTM D2270 140 – 152
Pour Point, ASTM D97 –35_F to –46_F
Industry Specifications:
API GL–4, AGCO Powerfluid 821 XL, Ford New
Holland FNHA–2–C–201.00, Kubota UDT, John Deere
J20C, Vickers 35VQ25 and Volvo WB–101/BM.
Note: Many hydraulic fluids are almost colorless, making it
difficult to spot leaks. A red dye additive for the hydraulic
system oil is available in 2/3 oz. (20 ml) bottles. One bottle
is sufficient for 4–6 gal (15–22 1) of hydraulic oil. Order
part no. 44–2500 from your authorized Toro distributor.
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 fluid filter and remove
filter.
4. Remove drain plug from fitting between axle housing
and oil filter and allow fluid to flow into drain pan
(Fig. 72).
1
Figure 72
1. Drain plug
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