JLG 600SC_660SJC Service Manual - Manual (Page 107)

SECTION 5 - CAT CHASSIS (S/N 0300128000 TO PRESENT)
3121157 – JLG Lift – 5-15
Hydraulic Fluid
1. Hydraulic fluid is an important factor for transmission
of power and lubrication of hydraulic components.
Selection and handling of the hydraulic fluid have a
great influence on the performance and life-span of
hydraulic equipment.
Lubricating oil having superior quality is generally
used as hydraulic fluid. It must be excellent in lubri-
cating ability, oxidization stability, corrosion protec-
tion and antiemulsification. It must not be erosive to
packing and sealing materials. Hydraulic fluids with
the oil of different property should not be mixed.
2. Range of Viscosity
(Idemitsu Daphne Hydraulic Fluid 46WR)
When starting up in low temperature, operate hydraulic
equipment in idle with no load.
Filters
The piston motor and the shuttle valve are so designed
that each of its parts is high in accuracy, clearance among
parts is very much limited, and parts are much sensitive to
foreign matters, such as sludge, iron powder, rust, filings,
grinding powder, etc.
Performance degradation of the piston motor and the
shuttle valves, and wear in sliding parts may be avoided
by keeping the oil clean.
Therefore, adequate filters are required to keep hydraulic
fluid in the hydraulic system clean, durable and reliable for
long term services with less maintenance and inspection.
The contamination level should be below NAS Class 9.
Filters should be placed at the discharge side of hydraulic
pump or at the return side of piston motor. Filter gradation
should be smaller than 10 microns (nominal). Use filter(s)
with a visual indicator by which the clogging is found from
the outside, and with a relief valve which by-passes the oil
depending on the clogged condition when the filter ele-
ment is clogged.
It is recommended that the contamination level of
hydraulic fluid should be below NAS Class 9.
Piping Work
1. Do acid-cleaning and remove scales inside the
tubes thoroughly before the assembly.
2. Ensure that foreign articles will not enter into the pis-
ton motor case from each port during the piping
work.
3. Flush the pipes thoroughly upon completion of pip-
ing work.
4. The drain piping should be separate and connected
directly to the tank.
5. It is recommended that the piston motor case be
constantly filled with oil to maintain satisfactory lubri-
cation.
Lubricating Oil for Reduction Gears
The following products are recommended.
Mitsubishi Diamond Hypoid Gear Oil #90 (Equivalent
to GL-4)
Notes:
1. Gear oil marked (*) is filled at the time of shipment
from our factory.
2. Use the same brand ,if the oil is supplied.
3. Select any of the above listed products at time of oil
change.
Cautions in Using Parking Brake
This motor is equipped with parking brake. (Refer to Fig-
ure 5-11. for working principle of parking brake.)
The parking brake is so designed as to operate when the
machine is stopped or parked. If the parking brake is used
as a brake during traveling of the machine (for braking
motor rotation), the motor shaft or reduction gear drive
gear may break as well as the disk plate may quickly wear.
This will result in brake failure, leading to personal injuries
by runaway of the machine.
Therefore, never use the parking brake as a brake while
the machine is traveling (for braking motor rotation).
VISCOSITY
EQUIVALENT OIL
TEMPERATURE (DEG)
Optimum Range of Viscosity 25 to 100 +22 to +55
Practical Range of Viscosity 20 to 500 – 3 to +63
DRAIN PRESSURE IN PISTON MOTOR CASE
Constant at 0.2 MPa or less
Intermittent at 0.5 MPa or less
BRAND MANUFACTURER
(*)Diamond Hypoid Gear Oil #90 Mitsubishi Oil
Apolloil Gear HE90 Idemitsu Kosan
Shell Hypoid Gear Oil CT90 Shell Oil
Cosmo Gear GL-490 Cosmo Oil
Gear Lub SP90 Nippon Oil