Hydraulic System Maintenance; Hydraulic System Safety; Relieving Hydraulic Pressure; Hydraulic Fluid Specifications - Toro 320-D Operator's Manual

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.
Relieving Hydraulic
Pressure
To relieve hydraulic pressure while the engine is on,
disengage the auxiliary hydraulics and fully lower the
loader arms.
To relieve the pressure while the engine is off, move
the auxiliary-hydraulics lever between the forward and
reverse flow positions to relieve auxiliary hydraulic
pressure, move the attachment-tilt lever forward and
rearward, and move the loader-arm lever forward to
lower the loader arms
Figure 39
(Figure 39).
Hydraulic Fluid
Specifications
Every 1,500 hours/Every 2 years (whichever
comes first)—Replace all moving hydraulic
hoses.
Hydraulic Tank Capacity: 56 L (14.8 US gallons)
Use only 1 of the following fluids in the hydraulic
system:
•
Toro Premium Transmission/Hydraulic Tractor
Fluid (refer to your Authorized Service Dealer for
more information)
•
Toro PX Extended Life Hydraulic Fluid (refer
to your Authorized Service Dealer for more
information)
•
If either of the above Toro fluids are not available,
you may use another Universal Tractor Hydraulic
Fluid (UTHF), but they must be only conventional,
petroleum-based products. The specifications
must fall within the listed range for all the following
material properties and the fluid should meet
the listed industry standards. Check with your
hydraulic fluid supplier to determine if the fluid
meets these specifications.
Note:
Toro will not assume responsibility for
damage caused by improper substitutions, so use
only products from reputable manufacturers who
will stand behind their recommendations.
Material Properties
Viscosity, ASTM D445
Viscosity index, ASTM D2270
Pour Point, ASTM D97
Industry Standards
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 fluid is available in 20 ml
(0.67 fl oz) bottles. One bottle is sufficient for 15 to
22 L (4 to 6 US gallons) of hydraulic fluid. Order
Part No. 44-2500 from your Authorized Service
g281214
Dealer.
37
cSt at 40°C: 55 to 62
cSt at 100°C: 9.1 to 9.8
140 to 152
-43 to -37°C (-46 to -35°F)