Skytrak 6036 Service Manual Bedienungsanleitung Seite 115
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Section 9. Hydraulic System
Model 6036 S/N 9B0499 and Before
9-2
oil from the base end of the cylinder to return
through ports A to D, Fig. 9.1, of the directional
control valve to the return filter and reservoir. If
supply pressure reaches 3,000 ± 50 psi (206,7 ±
3,4 bar), the main relief valve, Fig. 9.2, will open,
allowing hydraulic oil to return to the 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).
The counterbalance valve in each boom hoist
cylinder serves as a safety device. The counter-
balance valve functions as follows:
Should any of the hydraulic lines going to
either hoist cylinder fail, there will be a loss of
hydraulic system pressure to the cylinder(s).
Example:
If there was a hydraulic line failure
in the pressurized lowering line during lower-
Fig. 9.1 Boom Hoist Circuit
STRAINER
RESERVOIR
MAIN RELIEF
VALVE
port relief valve, Fig. 9.2, will open allowing
hydraulic oil to return to the reservoir.
Return oil from the top end of the boom hoist
cylinder piston is directed back to the directional
control valve through ports B to D, Fig. 9.1, to the
return filter and reservoir. If the filter becomes
clogged, hydraulic oil will bypass the filter when
the pressure reaches 10 to 15 psi
(0,7 to 1,03 bar).
Lower Position
When the joystick is placed in the lower position,
the directional control valve spool is shifted so that
supply pressure is directed through ports E to B,
Fig. 9.1, to the rod (top) end of both left and right
boom hoist cylinder pistons. This supply pressure
also pilots open the counterbalance valve, Fig.
9.1. The open counterbalance valve allows return
COUNTERBALANCE
VALVES
A B C A B C A B C
D E F D E F D E F
LOWER
CENTER
TO FRAME TILT
CYLINDER
TO GRILLE TILT AND
SLAVE CYLINDERS
MAIN CONTROL
VALVE
DIRECTIONAL CONTROL
VALVE POSITIONS
RETURN
FILTER
TO BOOM EXTEND/
RETRACT CYLINDER
RIGHT BOOM
HOIST CYLINDER
LEFT BOOM
HOIST CYLINDER
BOOM HOIST
RELIEF VALVE
0-4000 psi
PRESSURE
GAUGE
RAISE
15
GPM
30
GPM
TANDEM
PUMP
MA0421
LOWER
RAISE
- 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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