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Hydraulic System
Maintenance
Hydraulic System Safety
•
Seek immediate medical attention if fluid is injected
into skin. Injected fluid must be surgically removed
within a few hours by a doctor.
•
Ensure that all hydraulic-fluid hoses and lines are
in good condition and all hydraulic connections
and fittings are tight before applying pressure to
the hydraulic system.
•
Keep your body and hands away from pinhole
leaks or nozzles that eject high-pressure hydraulic
fluid.
•
Use cardboard or paper to find hydraulic leaks.
•
Safely relieve all pressure in the hydraulic system
before performing any work on the hydraulic
system.
Hydraulic Fluid
Specification
The hydraulic-fluid reservoir is filled at the factory with
high-quality hydraulic fluid. Check the level of the
hydraulic fluid before you start the engine for the
first time and daily thereafter.
Use Toro Premium All-Season Hydraulic Fluid
(Available in 5-gallon pails or 55-gallon drums. See
the Parts Catalog or Toro distributor for part numbers.)
If the Toro fluid is not available, you may use other
fluids provided that they meet all the following material
properties and industry specifications. Consult with
your lubricant distributor to identify a satisfactory
product.
Note:
Toro does not assume responsibility for
damage caused by improper substitutions, so use
only products from reputable manufacturers who will
stand behind their recommendation.
High-Viscosity Index/Low-Pour Point
Anti-Wear Hydraulic Fluid, ISO VG 46
Material Properties:
Viscosity, ASTM D445
Viscosity Index ASTM
D2270
Pour Point, ASTM D97
FZG, Fail stage
Water content (new fluid)
Industry Specifications:
Important:
The ISO VG 46 multigrade fluid
offers optimal performance in a wide range
of temperature conditions. For operation in
consistently high ambient temperatures, 65°F
(18°C) to 120°F (49°C), ISO VG 68 hydraulic fluid
may offer improved performance.
Important:
Many hydraulic fluids are almost
colorless, making it difficult to spot leaks. A
red dye additive for the hydraulic-system oil is
available in 20 ml (2/3 fl oz) bottles. 1 bottle is
sufficient for 15 to 22 L (4 to 6 US gallons) of
hydraulic oil. Order Toro Part No. 44-2500 from
your authorized Toro distributor.
Servicing the Hydraulic
System
Preparing to Service the Hydraulic
System
1.
Park the machine on a level surface.
2.
Disengage the PTO, lower the mower deck, and
engage the parking brake.
3.
Place all controls in the
start the engine.
4.
Run the engine at lowest possible engine speed
to purge the system of air.
Important:
Do not run the PTO.
5.
Cycle the steering wheel several times fully to
the left and right, and align the steering wheels
straight forward.
69
St @ 40°C 42 to 50
St @ 100°C 7.6 to 8.5
140 or higher
-40°F to -49°F
11 or better
500 ppm (maximum)
Vickers I-286-S (Quality Level),
Vickers M-2950-S (Quality
Level), Denison HF-0
position and
NEUTRAL
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