Skytrak 6036 Service Manual Manuel d'utilisateur Page 127
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- MARQUE LIVRES
Noté. / 5. Basé sur avis des utilisateurs
Section 9. Hydraulic System
Model 6036 S/N 9B0499 and Before
9-14
M
9.1.5 Brake Circuits
a. Description
Hydraulic pressure is normally applied in the
service and park lock brake circuits by the 15 gpm
section (front half) of the tandem pump, which
draws its fluid through a suction strainer in the
reservoir, Fig. 9.6. A pressure of 575 ± 25 psi
(39,6 ± 1,7 bar) is maintained on the service
brakes and park lock by the sequence valve. This
pressure is reduced to 525 ± 25 psi (36,2 ± 1,7
bar) at the pressure reducing valve prior to
entering the solenoid-operated park lock release
valve and pedal-operated service brake valve.
Steering and Emergency Brake Pump
The steering and emergency brake pump, Fig.
9.6, provides limited backup hydraulic supply
pressure to the steering and brake circuits in the
event of engine stoppage or tandem pump failure
and during initial start-up before the tandem pump
is fully operational. This pump is driven by an
electric motor; it also draws fluid through the
suction strainer in the reservoir.
The steering and emergency brake pump is
controlled by a oil pressure switch on the engine
which senses the engine oil pressure. When the
ignition switch is in RUN position and the pressure
switch is closed at oil pressure below 4 psi (0,3
bar), the steering and emergency brake pump is
energized and the pump will run. Output of the
pump is 3 gpm at approximately 1500 psi (104
bar). When the pressure rises above 4 psi (0,3
bar), (engine running), the oil pressure switch
opens to stop the steering and emergency brake
pump.
Service Brake Valve
When the brake pedal in the operator’s cab is
not depressed, the brake valve spool is spring-
15
GPM
30
GPM
STEERING AND
EMERGENCY
BRAKE PUMP
SEQUENCE
VALVE
TANDEM
PUMP
STRAINER
PRESSURE
REDUCING
VALVE
0-4000 psi
PRESSURE
GAUGE
PARK LOCK
RELEASE
VALVE
PARK
LOCK
3
GPM
C
TO POWER
STEERING
UNIT
DISENGAGED ENGAGED
Fig. 9.6 Brake Circuits
SERVICE
BRAKE
VALVE
SERVICE BRAKE VALVE
POSITIONS
RESERVOIR
BRAKES
APPLIED
BRAKES NOT
APPLIED
0-1000 psi
PRESSURE
GAUGE
0-1000 psi PRESSURE
GAUGE INSTALLED IN
PARK LOCK BLEEDER
MA0472
DC D
AB
CDCD
AB
- 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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