Skytrak 6036 Service Manual Bedienungsanleitung Seite 121
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Section 9. Hydraulic System
Model 6036 S/N 9B0499 and Before
9-8
Fig. 9.4 Grille Tilt and Slave Circuit
6. Repeat steps 4 and 5 to recheck performance.
7. If the boom extend/retract circuit test does not
meet performance requirements, locate the
cause of the problem and correct before
putting the vehicle into service.
9.1.3 Grille Tilt and Slave Circuit
a. Description
Hydraulic pressure is applied in the grille tilt and
slave circuit by the 30 gpm section (rear half) of
the tandem pump, which draws its fluid through a
suction screen in the reservoir, Fig. 9.4. Pressure
is directed to either side of the grille tilt and slave
cylinder pistons by the shifting of a spool in a
directional control valve found in the main control
valve assembly. The spool is shifted by the grille
and frame tilt control lever and its associated
control cable. Control lever positions for tilting the
grille are as follows:
Center Position
When the grille and frame tilt control lever is
placed in the center or neutral position, the
directional control valve spool is positioned so that
pump supply pressure is directed through ports F
to C, Fig. 9.4, to the return filter and reservoir. If
the return filter becomes clogged, hydraulic oil will
bypass the filter when the pressure reaches 10 to
15 psi
(0,7 to 1,03 bar).
Up Position
When the grille and frame tilt control lever is
placed in the “up” position, the directional control
valve spool is positioned so that pump supply
pressure is directed through ports E to A, Fig. 9.4,
to the base (extend) end of the grille tilt and slave
cylinders. The extension of the slave cylinder is
fixed by the position of the boom so that only the
grille tilt cylinder is extended to tilt the grille up. If
supply pressure reaches 2650 psi (182,6 bar), the
TO BOOM HOIST
CYLINDER
TO BOOM EXTEND
CYLINDER
TO FRAME TILT
CYLINDER
GRILLE TILT CYLINDER
SLAVE
CYLINDER
GRILLE TILT PORT
RELIEF VALVES
TANDEM
PUMP
RESERVOIR
STRAINER
RETURN
FILTER
DIRECTIONAL CONTROL VALVE
POSITIONS
MAIN CONTROL
VALVE
A B C A B C A B C
D E F D E F D E F
CENTER
15
GPM
30
GPM
0-4000 psi
PRESSURE
GAUGE
DOWN
DOWN
UP
UP
MA0452
COUNTER-
BALANCE
VALVE
- Service Manual 1
- Effectivity Page 3
- SECTION CONTENTS 5
- Danger ! 7
- 1.3 PERSONAL CONSIDERATIONS 8
- 1.4 EQUIPMENT CONSIDERATIONS 8
- 1.5 GENERAL CONSIDERATIONS 9
- 1.7 FINAL WORD 10
- SECTION 2 12
- GENERAL INSTRUCTIONS 12
- 2.3 REPLACEMENT 13
- 2.4 HOSES AND TUBES 13
- 2.1 INTRODUCTION 13
- 2.2 CLEANING 13
- 2.7 TORQUES 14
- 2.5 BEARINGS 14
- 2.6 PRESSURE TESTING 14
- AND ADJUSTMENT 14
- 2.8 PAINTING 15
- 2.10 FLUID LEVELS AND 16
- LUBRICATION 16
- 2.9 AFTER SERVICE STARTUP 16
- AND CHECKS 16
- IMPORTANT: 17
- SECTION 3 19
- Section 3. Boom 20
- GOOSENECK 20
- OUTER BOOM 21
- 3.1.3 Outer Boom Replacement 23
- 3.1.4 Chain Replacement 27
- 3.1.5 Chain Lubrication 28
- 3.1.6 Chain Tension Check 28
- 3.1.8 Wear Pad Replacement 29
- 3.1.9 Hose Tensioning 30
- 3.3 QUICK ATTACH 33
- ASSEMBLY 33
- 3.4 TROUBLESHOOTING 34
- 3.5 SPECIFICATIONS 35
- SECTION 4 37
- OPERATOR'S CAB 37
- 4.2.2 Travel Select and 38
- Range Select Levers 38
- 4.2.3 Boom Control and Grille 40
- 4.3 MECHANICAL FOOT 41
- CONTROLS 41
- FUEL PUMP 43
- 4.4 REAR VIEW MIRRORS 44
- SECTION 5 46
- Tube within Tire 49
- Three Piece Wheel 50
- 5.1.2 Demounting Tire 50
- 5.1.11 Mounting Tire 53
- 5.1.12 Mounting Standard Tire 53
- 5.1.13 Mounting Optional Tire 54
- 5.2.6 Park Lock Unit 66
- 5.2.7 Carrier Assembly 68
- 5.4 SPECIFICATIONS 72
- 5.5 TROUBLESHOOTING 73
- SECTION 6 75
- DRIVE SHAFTS AND DROP BOX 75
- 6.2 DROP GEAR BOX 77
- 6.3 SPECIFICATIONS 78
- 7.2 HOW TO TOW 82
- THE FORKLIFT 82
- 7.3 HOW TO DRAIN 82
- TRANSMISSION 82
- Section 7. Transmission 83
- 7.9 TROUBLESHOOTING 84
- 7.10 SPECIFICATIONS 85
- 8.1 ENGINE PREVENTIVE 88
- MAINTENANCE 88
- 8.1.4 250 Hour Intervals 90
- 8.1.5 500 Hour Intervals 91
- 8.1.6 1,000 Hour Intervals 92
- 8.2 ENGINE COOLING SYSTEM 95
- 8.4.5 Fuel Lift Pump 99
- 8.4.6 Fuel Filter 100
- Section 8. Engine 101
- 8.4.7 Fuel Injection Pump 102
- Caution ! 103
- Warning ! 103
- 8.6 ENGINE REMOVAL 105
- 8.8 ENGINE INSTALLATION 107
- 8.7 ENGINE OVERHAUL 107
- 8.9 HEAD TORQUE CHECK 110
- 8.10 STEM TIP TO ROCKER 110
- ARM CLEARANCE 110
- 8.11 ENGINE STORAGE 111
- 8.12 TROUBLESHOOTING 112
- Example: 115
- 9.1.2 Boom Extend/Retract 118
- Section 9. Hydraulic System 121
- 9.1.4 Frame Tilt Circuit 124
- 9.1.5 Brake Circuits 127
- 9.1.6 Power Steering Circuit 130
- Refer to paragraph 9.2a 138
- S/N 8L0333 AND BEFORE 165
- Threadlocker 242 178
- IMPORTANT 179
- DO NOT operate any boom or 179
- 9.5 TROUBLESHOOTING 184
- 9.6 SPECIFICATIONS 191
- 9.6 SPECIFICATIONS (cont.) 192
- SECTION 10 194
- ELECTRICAL SYSTEM 194
- 10.2 WARNING DEVICES 196
- 10.2.2 Backup Alarm 197
- 10.4 CIRCUIT BREAKERS 198
- 10.3 WIRING HARNESSES 198
- Section 10. Electrical System 200
- Electrical System Circuits 202
- 10.5 STARTING CIRCUIT 203
- 10.5.3 Starter 208
- 10.5.4 Starting Motor Relay 213
- Weather Starting 214
- 10.6 CHARGING CIRCUIT 215
- Size of Battery 225
- Temperature 225
- State-of-Charge 225
- 10.7 SWITCHES 227
- AND SOLENOIDS 227
- OFF RUN THERMO START START 228
- Terminals 228
- 10.7.2 Neutral Start Switch 229
- 10.7.3 Fuel Run Solenoid 229
- 10.7.4 Park Lock Switch 230
- 10.7.6 Reverse Switch 233
- 10.7.7 Steering Select Switch 233
- 10.8 GAUGES AND INDICATOR 234
- 10.8.3 Hourmeter 235
- 10.8.4 Warning Lights 236
- 10.8.5 Engine 237
- Low Oil Pressure Sender 237
- 10.8.6 Engine Coolant 238
- High Temperature Sender 238
- 10.8.8 Transmission 238
- 10.8.9 Fuel Gauge 239
- Lighting System Circuits 242
- 10.9 OPTIONAL 243
- LIGHTING SYSTEM 243
- 10.9.2 Momentary Brake Light 245
- (Stop Light) 245
- 10.10 WINDSHIELD 246
- WASHER/WIPER 246
- Reservoir (Enclosed Cab Only) 247
- 10.12 CAB HEATER 252
- (ENCLOSED CAB ONLY) 252
- 10.11 FAN SWITCH AND FAN 252
- MOTOR (OPTIONAL) 252
- (Enclosed Cab Only) 254
- 10.13 EMERGENCY BRAKING 255
- AND STEERING SYSTEM 255
- Hydraulic Pump 256
- (S/N 7P0013 and Before) 256
- (S/N 7P0014 thru 9B0499) 257
- 10.14 TROUBLESHOOTING 258
- CONTENTS 258
- Important: Never jumper a 260
- IMPORTANT: Use only 265
- 10.15 SPECIFICATIONS 277
- JLG Worldwide Locations 280
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