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

Hydraulic System
Maintenance

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. The
recommended replacement fluid is:
Toro Premium All Season Hydraulic 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 fluids
may be used provided they meet all the following material
properties and industry specifications. 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.
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 has been
found to offer 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.
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
St @ 40° C 44 to 48
St @ 100° C 7.9 to 8.5
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
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. One bottle is sufficient for 15-22 liters (4-6
gallons) of hydraulic oil. Order part no. 44-2500 from
your authorized Toro distributor.
1. Position the machine on a level surface, lower the
cutting units, stop the engine, and remove the key.
2. On the right side of the machine, raise the access cover
to expose the hydraulic tank cap
3. Clean the area around the filler neck and cap of the
hydraulic tank (Figure
filler neck.
1. Hydraulic tank cap
4. Remove the dipstick from the filler neck and wipe it
with a clean rag. Insert the dipstick into the filler neck;
then remove it and check the fluid level. The fluid
level should be within the safe operating range on the
dipstick (Figure
56
(Figure 88).
88). Remove the cap from the
Figure 88
89).