Skytrak 6036 Service Manual Bedienungsanleitung Seite 171
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Section 9 Hydraulic System
Model 6036/6036T S/N 9B0500 thru 14833
9-21
Warning
Relieve hydraulic pressure before servicing any
hydraulic component. Escaping hydraulic fluid
under pressure can penetrate the skin causing
serious injury.
Right Position
When the grille and frame tilt control lever is
placed in the “right” position, the directional control
valve spool is positioned so that pump applied
pressure is directed through ports E to B, Fig.
9.13, to the rod (retract) end of the frame tilt
cylinder piston. This supply pressure also pilots
open the pilot-operated check valve on the base
(extend) end of the frame tilt cylinder. If supply
pressure reaches 1300 ± 50 psi (89,6 ± 3,4 bar),
the frame tilt “right” relief valve, Fig. 9.13, will
open allowing hydraulic oil to return to the return
filter and reservoir, Fig. 9.13.
Return oil from the base end of the frame tilt
cylinder piston is directed back to the directional
control valve though ports C to F, Fig 9.13, 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 (0,69
to 1,03 bar).
Pilot-operated check valves, Fig. 9.13, in the
frame tilt cylinder permit free flow on both ends of
the cylinder piston when supply pressure is
applied to open either pilot-operated check valve.
When the grille and frame tilt control lever is not
activated, no supply pressure is applied. The two
check valves prevent any back flow of hydraulic oil
and the frame tilt cylinder is locked in position.
9.4.3 Frame Tilt Circuit
a. Description
Hydraulic pressure is applied in the frame tilt
circuit by the 15 gpm section (front half) of the
tandem pump, which draws its fluid through a
suction screen in the reservoir, Fig. 9.13. Pres-
sure is supplied through the sequence valve and
the load sensing steering priority valve to the
secondary control valve. Pressure is then directed
to either side of the frame tilt cylinder piston by the
shifting of a spool in a directional control valve
found in the secondary 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 frame 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 D
to A, Fig. 9.13, 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 (0,6,9 to 1,03 bar).
Left Position
When the grille and frame tilt control lever is
placed in the “left” position”, the directional control
valve spool is positioned so that pump supply
pressure is directed through ports E to C , Fig.
9.13, to the base (extend) end of the frame tilt
cylinder piston. This supply pressure also pilots
open the pilot-operated check valve on the rod
(retract) end of the frame tilt cylinder. If supply
pressure reaches 1300 ± 50 psi (89,6 ± 3,4 bar),
the frame tilt “left” relief valve, Fig. 9.13, will
open allowing hydraulic oil to return to the return
filter and reservoir, Fig. 9.13.
Return oil from the rod end of the frame tilt cylin-
der piston is directed back to the directional
control valve though ports B to F, Fig. 9.13, 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
(0,69
to 1,03 bar).
b. Pressure Checks and Adjustments
Frame Tilt Left Relief Valve
1. Engage the park lock, place the travel select
lever in neutral, and stop the engine.
2. Operate the hydraulic controls after the engine
has stopped to relieve any trapped pressure.
- Service Manual 1
- Effectivity Page 3
- SECTION CONTENTS 5
- SECTION 1 7
- SAFETY PRACTICES 7
- 1.3 PERSONAL CONSIDERATIONS 8
- 1.4 EQUIPMENT CONSIDERATIONS 8
- 1.5 GENERAL CONSIDERATIONS 9
- 1.7 FINAL WORD 10
- SECTION 2 11
- GENERAL INSTRUCTIONS 11
- 2.1 INTRODUCTION 12
- 2.2 CLEANING 12
- 2.3 REPLACEMENT 12
- 2.4 HOSES AND TUBES 12
- 2.7 TORQUES 13
- 2.5 BEARINGS 13
- 2.6 PRESSURE TESTING 13
- AND ADJUSTMENT 13
- 2.8 PAINTING 14
- 2.9 AFTER SERVICE 15
- STARTUP AND CHECKS 15
- 2.10 FLUID LEVELS 16
- AND LUBRICATION 16
- SECTION 3 19
- Fig. 3.3) 20
- Section 3 Boom 21
- 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
- 3.2 EMERGENCY BOOM 32
- LOWERING 32
- 3.2.2 Hydraulic Line Failure 33
- 3.3 QUICK ATTACH 34
- ASSEMBLY 34
- Excessive 35
- 3.5 SPECIFICATIONS 36
- SECTION 4 37
- OPERATOR'S CAB 37
- 4.2.2 Travel Select 38
- Section 4 Operator's Cab 39
- 4.2.3 Boom Control and Grille 40
- 4.3 ELECTRONIC 41
- JOYSTICK 41
- (without TLC) 42
- Replacement without TLC 45
- 4.4 MECHANICAL FOOT 46
- CONTROLS 46
- FUEL PUMP 48
- 4.5 REAR VIEW MIRRORS 49
- SECTION 5 51
- 5.1 WHEEL ASSEMBLY 52
- AND TIRE 52
- Tube within Tire 54
- 5.1.2 Demounting Tire 55
- 5.1.4 Demounting Tire from 55
- Three Piece Wheel 55
- (S/N OF1191 & Before) 55
- 5.1.11 Mounting Tire 58
- 5.2 AXLE ASSEMBLY 61
- 5.2.1 Axle 62
- ALWAYS replace with new ones 64
- 5.2.4 Axle Steering Joints 67
- 5.2.6 Park Lock Unit 71
- 5.2.7 Carrier Assembly 73
- 5.3 AXLE LUBRICATION 76
- 5.3.3 Wheel End Brake Oil 77
- 5.4 SPECIFICATIONS 78
- 5.5 TROUBLESHOOTING 78
- SECTION 6 79
- DRIVE SHAFTS AND DROP BOX 79
- 6.2 DROP GEAR BOX FOR 81
- S/N 9N0941 AND BEFORE 81
- 6.2.2 Oil Seals 82
- 6.3 DROP GEAR BOX FOR 83
- S/N 9N0942 AND AFTER 83
- 6.4 SPECIFICATIONS 85
- SECTION 7 87
- 7.2 HOW TO TOW 88
- THE FORKLIFT 88
- Section 7 Transmission 89
- 7.9 TROUBLESHOOTING 90
- 7.10 SPECIFICATIONS 91
- SECTION 8A 93
- 8A.4.2 Maintenance Intervals 95
- 8A.5.1 Inspect the Engine 95
- 8A.6 ENGINE MAINTENANCE 98
- Every 250 Hours 98
- 8A.7 ENGINE MAINTENANCE 99
- Every 500 Hours 99
- 8A.7.2 Clean Sediment Chamber 100
- 8A.8 ENGINE MAINTENANCE 101
- Every 1,000 Hours 101
- 8A.8.2 Replace Air Filter 102
- Primary Element 102
- 8A.9 ENGINE MAINTENANCE 103
- Every 2,500 Hours 103
- 8A.10 ENGINE OIL 104
- SPECIFICATIONS 104
- 8A.11 ENGINE COOLING 104
- 8A.11.2 Radiator Pressure Cap 105
- Section 8A Perkins Engine 106
- 8A.12 ENGINE ELECTRICAL 107
- 8A.13 ENGINE FUEL SYSTEM 107
- 8A.13.4 Fuel Pre-Filter 109
- 8A.13.5 Fuel Lift Pump 109
- 8A.13.6 Fuel Filter 110
- 8A.13.7 Fuel Injection Pump 111
- 8A.13.8 Fuel Injectors 111
- 8A.14 ENGINE EXHAUST 112
- 8A.15 HOW TO REMOVE 113
- ENGINE FROM FORKLIFT 113
- 8A.16 HOW TO OVERHAUL 115
- THE ENGINE 115
- 8A.17 HOW TO INSTALL THE 115
- ENGINE IN FORKLIFT 115
- 8A.18 HOW TO TORQUE 117
- CYLINDER HEAD 117
- SCREWS AND NUTS 117
- 8A.19 ENGINE STORAGE 118
- 8A.20 TROUBLESHOOTING 119
- SECTION 8B 121
- Section 8B Cummins Engine 122
- 8B.3.2 Maintenance Intervals 123
- 8B.4.1 Inspect the Engine 123
- 8B.5 ENGINE MAINTENANCE 126
- EVERY 250 HOURS 126
- OR 3 MONTHS 126
- 8B.6 ENGINE MAINTENANCE 128
- EVERY 500 HOURS 128
- OR 6 MONTHS 128
- 8B.7 ENGINE MAINTENANCE 130
- EVERY 1,000 HOURS OR 130
- ANNUALLY 130
- 8B.7.2 Tensioner Bearing 131
- 8B.7.3 Fan Hub 131
- 8B.7.4 Check Valve Stem 131
- 8B.7.5 Drain Cooling System 132
- 8B.7.8 Replace Air Filter 133
- 8B.8 ENGINE OIL 134
- 8B.9 ENGINE COOLING 134
- 8B.9.2 Radiator Pressure Cap 135
- 8B.10 ENGINE ELECTRICAL 136
- 8B.11 ENGINE FUEL SYSTEM 136
- 8B.11.2 Fuel Tank 138
- 8B.11.7 Fuel Injectors 139
- 8B.11.5 Dual Head Fuel Filter 139
- 8B.12 ENGINE EXHAUST 141
- 8B.13 HOW TO REMOVE 143
- 8B.14 HOW TO OVERHAUL 144
- 8B.15 HOW TO INSTALL THE 144
- 8B.16 ENGINE STORAGE 147
- 8B.17 TROUBLESHOOTING 149
- SECTION 9 151
- HYDRAULIC SYSTEM 151
- 9.1 SYSTEM OPERATION 152
- 9.2 MAIN CONTROL VALVE 152
- OPERATION 152
- CABLE CONTROL 152
- Section 9 Hydraulic System 153
- 9.3 MAIN CONTROL VALVE 160
- ELECTRONIC CONTROL 160
- 9.4 SECONDARY CONTROL 166
- VALVE OPERATION 166
- Example: 167
- 9.4.3 Frame Tilt Circuit 171
- 9.4.4 Brake Circuits 174
- (S/N 9B0500 thru OE1179 – 174
- Without Trans. De-Clutch) 174
- 9.4.5 Brake Circuits 176
- (S/N OE1180 and After – 176
- With Trans. De-Clutch) 176
- 9.4.6 Power Steering Circuit 179
- 9.5 CYLINDERS 185
- Refer to paragraph 9.5.a 187
- 9.5.4 Boom Extend Cylinder 192
- 9.5.7 Slave Cylinder 197
- 9.5.8 Grille Tilt Cylinder 200
- 9.5.9 Frame Tilt Cylinder 203
- 9.5.10 Steering Cylinder 206
- (S/N 3101 & Before) 206
- 9.5.11 Steering Cylinder 209
- (S/N 3102 & After) 209
- (Optional) 212
- 9.6 VALVES 218
- Electronic Control 222
- SUPPLY PORT 224
- RETURN PORT 224
- EXT. RAISE 224
- 9.6.3 Brake Valve 232
- 9B0500 thru OE1179) 237
- 9.6.7 Steer Select Valve 239
- 9.6.8 Priority Valve 240
- 9.7 PUMPS 241
- Threadlocker 242 246
- IMPORTANT 247
- DO NOT operate any boom or 247
- 9.8 TROUBLESHOOTING 248
- HYDRAULIC DIAGRAM 258
- (Cable Controlled with 258
- Transmission De-Clutch) 258
- Hydraulic Pump Flow Test 259
- HYDRAULIC TESTING 259
- 9.9 SPECIFICATIONS 260
- 9.9 SPECIFICATIONS (cont.) 261
- SECTION 10 263
- ELECTRICAL SYSTEM 263
- Warning ! 264
- 10.2 WARNING DEVICES 265
- EMERGENCY 266
- 10.3 WIRING HARNESSES 267
- 10.4 CIRCUIT BREAKERS 267
- AND/OR FUSES 267
- Section 10. Electrical System 268
- S/N 1883 and After 269
- 10.5 STARTING CIRCUIT 276
- 10.5.2 Starter 278
- 10.5.3 Starting Motor Relay 279
- Weather Starting - Perkins 281
- 10.6 CHARGING CIRCUIT 282
- Size of Battery 286
- Temperature 286
- State-of-Charge 286
- Charger Capacity 286
- 10.7 SWITCHES 288
- AND SOLENOIDS 288
- 10.7.2 Neutral Start Switch 289
- 10.7.3 Fuel Run Solenoid 290
- 10.7.4 Park Lock Switch 292
- 10.7.6 Steering Select Switch 293
- 10.7.5 Reverse Switch 293
- 10.8 GAUGES AND INDICATOR 294
- 10.8.3 Hourmeter 295
- 10.8.5 Engine 297
- Low Oil Pressure Sender 297
- 10.8.6 Engine Coolant 298
- High Temperature Sender 298
- 10.8.8 Transmission 298
- 10.8.9 Fuel Gauge 299
- 10.9 OPTIONAL 305
- LIGHTING SYSTEM 305
- 10.9.2 Momentary Brake Light 307
- (Stop Light) 307
- Reservoir (Enclosed Cab Only) 309
- (Enclosed Cab Only) 311
- 10.10.5 Roof Washer Motor and 313
- Reservoir - Later Models 313
- (Enclosed Cab Only) - Later 313
- Cab Only) - Later Models 314
- 10.11 FAN SWITCH AND FAN 315
- MOTOR (OPTIONAL) 315
- 10.12 CAB HEATER 315
- (ENCLOSED CAB ONLY) 315
- 10.14 TROUBLESHOOTING 318
- CONTENTS 318
- Important: Never jumper a 320
- IMPORTANT: Use only 325
- 10.15 SPECIFICATIONS 337
- JLG Worldwide Locations 342
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