Hydraulic System Maintenance; Hydraulic System Safety; Checking The Hydraulic Fluid - Toro 31598 Operator's Manual

Hydraulic System
Maintenance

Hydraulic System Safety

WARNING
Hydraulic fluid escaping under pressure can
penetrate skin and cause injury.
• 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.
• Seek immediate medical attention if fluid is
injected into skin.

Checking the Hydraulic Fluid

Service Interval: Before each use or daily—Check the
hydraulic fluid level.
The machines reservoir is filled at the factory with
approximately 71.9 L (19 U.S. gallons) of high quality
hydraulic fluid. Check the level of the hydraulic fluid
before the engine is first started 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, other fluids may be used
provided 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 St @ 40° C 44 to 48
St @ 100° C 7.9 to 8.5
55
High Viscosity Index/Low Pour Point
Anti-wear Hydraulic Fluid, ISO VG 46 (cont'd.)
Viscosity Index ASTM
D2270
Pour Point, ASTM D97
FZG, Fail stage
Water content (new fluid)
Industry Specifications:
Important: The ISO VG 46 Multigrade fluid has been
found to offer optimal performance in a wide range of
temperature conditions. For operation in consistently
high ambient temperatures, 18°C (65°F) to 49°C
(120°F), ISO VG 68 hydraulic fluid may offer improved
performance.
Premium Biodegradable Hydraulic Fluid-Mobil EAL
EnviroSyn 46H
Important: Mobil EAL EnviroSyn 46H is the only
synthetic biodegradable fluid approved by Toro. This
fluid is compatible with the elastomers used in Toro
hydraulic systems and is suitable for a wide-range
of temperature conditions. This fluid is compatible
with conventional mineral oils, but for maximum
biodegradability and performance, the hydraulic system
should be thoroughly flushed of conventional fluid. The
oil is available in 5 gallon containers or 55 gallon drums
from your Mobil Distributor.
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 oz)
bottles. 1 bottle is sufficient for 15 to 22 L (4 to 6 gallons)
of hydraulic oil. Order Toro Part No. 44-2500 from your
authorized Toro distributor.
1. Perform the premaintenance procedure; refer to
Preparing the Machine for Maintenance (page
2. On the right side of the machine, raise the access cover
to expose the hydraulic-tank cap
140 to 160
-34° 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
38).
(Figure 87).