JLG 600SC_660SJC Service Manual - Manual (Page 93)

SECTION 5 - CAT CHASSIS (S/N 0300128000 TO PRESENT)
3121157 – JLG Lift – 5-1
SECTION 5. CAT CHASSIS (S/N 0300128000 TO PRESENT)
5.1 PRECAUTIONS FOR USE
General
REMOVE THE MOTOR FROM THE MACHINE BEFORE DISASSEMBLY
AND REASSEMBLY OF THE MOTOR. DISASSEMBLY WHILE THE
MOTOR IS INSTALLED TO THE MACHINE MAY CAUSE RUNAWAY OF
THE MACHINE.
DO NOT DISASSEMBLE OR REASSEMBLE THE MOTOR IF IT IS HOT.
DOING SO WILL RESULT IN BURNS.
FOLLOW THE MAINTENANCE MANUAL AND USE SPECIFIED TOOLS
TO DISASSEMBLE AND REASSEMBLE THE MOTOR.
Installation
WHEN INSTALLING THE MOTOR, BE SURE TO OBSERVE INSTRUC-
TIONS DESCRIBED IN THE OPERATING MANUAL.
DO NOT PLACE RADIAL LOAD AND THRUST LOAD EXCEEDING THE
PERMISSIBLE VALUES ON THE OUTPUT SHAFT. EXCESSIVE LOAD
MAY CAUSE EARLY BREAKAGE OF BEARINGS. USE THE MACHINE
WITHIN THE PERMISSIBLE RANGE, REFERRING TO THE LIFE CURVE
OF THE BEARINGS IN THE CATALOG.
WHEN INSTALLING, MAKE THE ECCENTRIC AMOUNT TO THE
DRIVEN SHAFT AT 0.1 MM (FIR) OR LESS. LARGE ECCENTRICITY
MAY CAUSE EARLY BREAKAGE OF THE BEARINGS AND BREAKAGE
OF THE INSIDE OF THE MOTOR.
Hydraulic System
SET THE HYDRAULIC PRESSURE TANK SO THAT ITS OIL LEVEL IS
ABOVE THE MOTOR. IF THE OIL LEVEL OF THE HYDRAULIC PRES-
SURE TANK IS BELOW THE MOTOR, INSTALL A CHECK VALVE IN
THE PIPING TO PREVENT OIL FROM COMING OUT OF THE MOTOR
CIRCUIT.
IF OIL COMES OUT OF THE MOTOR CIRCUIT, AERATION WILL
OCCUR IN THE MOTOR CIRCUIT. THIS IS VERY DANGEROUS, AS
LIFTED LOAD MAY DROP SUDDENLY.
IF NO OIL REMAINS IN THE MAIN PIPING, AERATION WILL OCCUR
IN THE MOTOR CIRCUIT DURING OPERATION, CAUSING DAMAGE
TO THE EQUIPMENT. IN ADDITION, A RUNAWAY PHENOMENON
OCCURS IN THE MOTOR CIRCUIT, LEADING TO A SUDDEN DROP OF
LIFTED LOAD. IN SOME CASES, THE MOTOR BECOMES IMPOSSI-
BLE TO CONTROL, WHICH IS VERY DANGEROUS.
WHEN THE MACHINE IS NOT OPERATED FOR AN EXTENDED
PERIOD OF TIME, BE SURE TO FILL THE MOTOR CIRCUIT WITH
HYDRAULIC FLUID BEFORE OPERATION.
WHEN THE MACHINE IS NOT OPERATED FOR AN EXTENDED
PERIOD OF TIME, AERATION MAY OCCUR IN THE MOTOR CIRCUIT
DUE TO LEAKS FROM THE HYDRAULIC MOTOR AND COUNTER BAL-
ANCE VALVE. INSTALL A SELF-PRIMING CIRCUIT TO PREVENT AER-
ATION.
OPERATION WITH AERATION IN THE MOTOR CIRCUIT WILL GENER-
ATE CAVITATION, CAUSING DAMAGE TO THE EQUIPMENT. IN ADDI-
TION, A RUNAWAY PHENOMENON OCCURS IN THE HYDRAULIC
MOTOR, LEADING TO A SUDDEN DROP OF LIFTED LOAD.
CHECK FOR INFLOW DIRECTION OF OIL AND ROTATION DIRECTION
OF THE MOTOR BEFORE PERFORMING PIPING WORK. FOR INFLOW
DIRECTION OF OIL AND ROTATION DIRECTION OF THE MOTOR,
REFER TO THE OUTLINE DRAWING.
PERFORMING PIPING WORK WITHOUT CHECKING FOR INFLOW
DIRECTION OF OIL AND ROTATION DIRECTION OF THE MOTOR IS
VERY DANGEROUS, AS THE MOTOR MAY ROTATE IN A DIRECTION
NOT INTENDED BY AN OPERATOR.
WHEN PIPING EACH PORT, BE SURE TO OBSERVE INSTRUCTIONS
DESCRIBED IN THE OPERATING MANUAL.
TAKE OUT DRAIN PIPING FROM THE DRAIN PORT (DR) ON THE
UPPERMOST POSITION, AND PLACE IT HIGHER THAN THE TOP END
OF THE MOTOR. THEN, RETURN IT DIRECTLY INTO OIL IN THE
TANK.
NO OIL IN THE MOTOR CASE MAY CAUSE SEIZURE ON EACH SLID-
ING SURFACE, LEADING TO AN INABILITY OF THE MOTOR TO OPER-
ATE.
KEEP DRAIN PRESSURE IN THE CASING AT 0.2 MPA OR LESS
(WORKING CONDITION) AS PERMISSIBLE PRESSURE, AND BE
SURE TO RETURN THE PIPING END INTO OIL.
IF DRAIN PRESSURE EXCEEDS THE PERMISSIBLE VALUE, DAMAGE
TO OIL SEALS AND OIL LEAKS MAY BE CAUSED.
Hydraulic Fluid
KEEP THE CONTAMINATION LEVEL OF HYDRAULIC FLUID BELOW
NAS CLASS 9. INSTALL FILTERS GRADATION OF WHICH IS NOT