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HYDRAULIC PUMP (Cont’d) Assembly (Cont’d) Install the backup seals/O–ring seals (Item 1) [A]. Install the large O–ring (Item 2) [A]. Install the end housing (Item 1) [B]. Install the four pump housing bolts [B]. Tighten the bolts to 45–50 ft.–lbs. (61–68 Nm) torque [C]. –2–52– A B C 2 1 1 CD–15154 CD–15155 CD–15156 853, 853H BICS Loader Service Manual
HYDRAULIC PUMP (Double Gear) 853H Checking the Output of the Pump The tools listed will be needed to do the following procedure: MEL10003 – Hydraulic Tester MEL10006 – Hydraulic Test Kit NOTE: Make sure all the air is removed from the hydraulic system before beginning the test. Air in the system can give an inaccurate test. *Relief pressure must be per specification before the test is done. Lift and block the loader. (See Page 1–1.) Raise the operator cab. (See Page 1–1.) Connect the remote start switch. (See Page 1–1.) Disconnect the OUTLET hose (Item 1) [A] Large Section; or (Item 2) [A] Small Section from the pump. Connect the INLET hose from the tester to the OUTLET of the pump. Connect the OUTLET hose from the tester to the hose which was disconnected from the pump [B]. Put jackstands under the front axles and rear corners of the frame before running the engine for service. Failure to use jackstands can allow the machine to fall or move and cause injury or death. W–2017–0286 Start the engine and run at low idle RPM. Make sure the tester is connected correctly. If no flow is indicated on the tester, the hoses are connected wrong. With the hoses connected correctly, increase the engine speed to full RPM. Warm the fluid to 140°F. (60°C.) by turning the restrictor control on the tester to about 1000 PSI (6895 kPa). DO NOT exceed system relief pressure. Open the restrictor control and record the free flow (GPM) at full RPM. Push the mode switch (on the remote start switch) to engage the front auxiliary hydraulics, the light will come ON. Push the button (on the right steering lever) for fluid pressure to the quick coupler (fluid pressure will go over main relief). Record the highest pressure (PSI) and flow (GPM). The high pressure flow must be at least 80% of free flow. % = HIGH PRESSURE FLOW (GPM) X 100 FREE FLOW (GPM) A low percentage may indicate a pump problem. A B 1 2 P–5199 P–5198 853, 853H BICS Loader –2–53– Service Manual
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EQUIPPED WITH BOBCAT INTERLOCK CONT
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FOREWORD . . . . . . . . . . . . .
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17. Inspect the air cleaner for dam
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SAFETY INSTRUCTIONS Instructions ar
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SERIAL NUMBER LOCATIONS Always use
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All 853 & 853H Bobcat loaders are e
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PREVENTIVE MAINTENANCE Page Number
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SERVICE SCHEDULE Maintenance work m
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TRANSPORTING THE LOADER Procedure A
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LIFT ARM SUPPORT DEVICE Never work
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OPERATOR CAB (Cont’d) Lowering th
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AIR CLEANER SERVICE Replacing Filte
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FUEL SYSTEM Fuel Specifications Use
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ENGINE LUBRICATION SYSTEM Checking
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ENGINE COOLING SYSTEM Cleaning the
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USING A BOOSTER BATTERY (Jump Start
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HYDRAULIC/HYDROSTATIC SYSTEM (Cont
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SPARK ARRESTOR MUFFLER Cleaning Pro
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FINAL DRIVE TRANSMISSION (CHAINCASE
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LUBRICATING THE LOADER (Cont’d) P
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REMOTE START SWITCH (Cont’d) Proc
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HYDRAULIC SYSTEM Page Number BUCKET
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1 FLUID RESERVOIR: Cap . . . . 15.5
Page 49 and 50: HYDRAULIC/HYDROSTATIC SCHEMATIC 853
Page 51 and 52: HYDRAULIC SYSTEM TROUBLESHOOTING Ch
Page 53 and 54: LIFT CYLINDER(S) Checking the Lift
Page 55 and 56: TILT CYLINDER Checking the Tilt Cyl
Page 57 and 58: HYDRAULIC CYLINDER Lift Cylinder Id
Page 59 and 60: HYDRAULIC CYLINDER (Cont’d) Disas
Page 61 and 62: HYDRAULIC CYLINDER (Cont’d) Disas
Page 63 and 64: HYDRAULIC CYLINDER (Cont’d) Assem
Page 65 and 66: HYDRAULIC CYLINDER (Cont’d) Assem
Page 67 and 68: MAIN RELIEF VALVE Checking the Main
Page 69 and 70: MAIN RELIEF VALVE (Cont’d) Remova
Page 71 and 72: DUAL PRESSURE MAIN RELIEF VALVE - 8
Page 73 and 74: DUAL PRESSURE MAIN RELIEF VALVE - 8
Page 75 and 76: SELECT VALVE (G.E.M. Block) 853H Ch
Page 77 and 78: HYDRAULIC CONTROL VALVE (Cont’d)
Page 93 and 94: HYDRAULIC PUMP Checking the Output
Page 95 and 96: HYDRAULIC PUMP (Cont’d) Parts Ide
Page 97 and 98: HYDRAULIC PUMP (Cont’d) Disassemb
Page 99: HYDRAULIC PUMP (Cont’d) Assembly
Page 103 and 104: HYDRAULIC PUMP (Double Gear) 853H (
Page 113 and 114: HYDRAULIC FLUID RESERVOIR Removal a
Page 115 and 116: HYDRAULIC FILTER HOUSING Removal an
Page 117 and 118: PEDAL INTERLOCK LINKAGE Removal and
Page 119 and 120: Revised June 96 HYDROSTATIC SYSTEM
Page 121 and 122: TROUBLESHOOTING Chart The following
Page 123 and 124: FRONT PANEL Removal and Installatio
Page 125 and 126: STEERING LEVERS Disassembly and Ass
Page 127 and 128: STEERING LEVERS (Cont’d) Pre-Adju
Page 129 and 130: STEERING LEVERS (Cont’d) Adjustin
Page 131 and 132: STEERING LEVERS (Cont’d) Adjustin
Page 133 and 134: HYDROSTATIC MOTOR Removal and Insta
Page 135 and 136: HYDROSTATIC MOTOR (Cont’d) Disass
Page 141 and 142: HYDROSTATIC MOTOR (Cont’d) Assemb
Page 143 and 144: HYDROSTATIC MOTOR (Cont’d) 853, 8
Page 145 and 146: HYDROSTATIC PUMP Removal and Instal
Page 147 and 148: HYDROSTATIC PUMP (Cont’d) Repleni
Page 149 and 150: HYDROSTATIC PUMP (Cont’d) Parts I
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HYDROSTATIC PUMP (Cont’d) Parts I
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HYDROSTATIC PUMP (Cont’d) Hydraul
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HYDROSTATIC PUMP (Cont’d) Charge
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HYDROSTATIC PUMP (Cont’d) Disasse
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HYDROSTATIC PUMP (Cont’d) Inspect
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HYDROSTATIC PUMP (Cont’d) Assembl
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HYDROSTATIC PUMP (Cont’d) Hydraul
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HYDROSTATIC PUMP (Cont’d) Hydrost
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DRIVE BELT Adjusting the Drive Belt
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DRIVE BELT TENSIONER PULLEY Removal
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DRIVE BELT TENSIONER PULLEY (Cont
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Page 189 and 190:
Page 191 and 192:
OIL COOLER Removal and Installation
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DRIVE SYSTEM Page Number AXLE SEAL
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DRIVE SYSTEM PARKING BRAKE PEDAL Re
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PARKING BRAKE DISC Removal and Inst
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FRONT CHAINCASE COVER Removal and I
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AXLE SEAL (Cont’d) Removal and In
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AXLE, BEARINGS AND SPROCKET (Cont
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AXLE, BEARING AND SPROCKET (Cont’
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REDUCTION GEARCASE (Cont’d) Remov
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REDUCTION GEARCASE (Cont’d) Disas
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REDUCTION GEARCASE (Cont’d) Disas
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REDUCTION GEARCASE (Cont’d) Assem
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REDUCTION GEARCASE (Cont’d) Assem
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DRIVE CHAIN 853, 853H BICS Service
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MAIN FRAME Page Number BOB-TACH Bob
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MAIN FRAME SEAT BAR Removal and Ins
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SEAT BAR (Cont’d) Removal and Ins
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OPERATOR CAB GAS CYLINDER Removal a
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OPERATOR CAB Removal and Installati
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OPERATOR SEAT Removal and Installat
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BOB-TACH (Cont’d) Removal and Ins
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BOB-TACH (Cont’d) Bob-Tach Lever
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REAR GRILL Removal and Installation
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REAR DOOR (Cont’d) Hood Removal a
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FUEL TANK (Cont’d) Removal and In
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ELECTRICAL SYSTEM Page Number ALTER
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WIRE LEGEND NO.'s COLOR GAUGE PARTS
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WIRE LEGEND NO.'s COLOR GAUGE 12 Or
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ELECTRICAL SYSTEM TROUBLESHOOTING C
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BATTERY Removal and Installation Ba
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ALTERNATOR (Cont’d) Alternator Re
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ALTERNATOR (Cont’d) Disassembly a
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ALTERNATOR (Cont’d) Assembly Reve
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STARTER (Cont’d) Checking the Sta
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STARTER (Cont’d) Disassembly and
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STARTER (Cont’d) Cleaning and Ins
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FRONT LIGHTS Removal and Installati
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ENGINE SERVICE Page Number AIR CLEA
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ENGINE SERVICE TROUBLESHOOTING Char
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RADIATOR Removal and Installation O
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COOLANT RECOVERY TANK Removal and I
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AIR CLEANER HOUSING Removal and Ins
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BLOWER HOUSING/FAN GEARBOX (Cont’
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BLOWER FAN Removal and Installation
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FAN GEARBOX (Cont’d) Disassembly
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FAN GEARBOX (Cont’d) Assembly (Co
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FAN GEARBOX (Cont’d) Assembly (Co
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FAN GEARBOX (Cont’d) 853, 853H BI
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FAN GEARBOX (Cont’d) Checking Bac
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ENGINE (Cont’d) Removal and Insta
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ENGINE (Cont’d) Engine Mount Repl
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BELT SHIELD Removal and Installatio
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GLOW PLUGS Removal and Installation
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FUEL INJECTION PUMP (Cont’d) Remo
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FUEL INJECTION PUMP (Cont’d) Remo
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FUEL INJECTION PUMP (Cont’d) Timi
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FUEL INJECTOR NOZZLES (Cont’d) Re
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CYLINDER HEAD Removal and Installat
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VALVES, VALVE SEAT AND GUIDE Remova
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VALVES, VALVE SEAT AND GUIDE (Cont
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PISTON AND CONNECTING ROD Removal R
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PISTON AND CONNECTING ROD (Cont’d
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PISTON AND CONNECTING ROD (Cont’d
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CYLINDER LINERS Checking the Cylind
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MAIN BEARINGS (Cont’d) Installati
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CRANKSHAFT Removal and Installation
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CRANKSHAFT GEAR Removal and Install
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TIMING GEARCASE COVER Removal and I
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IDLER GEAR AND HUB Removal Remove t
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FUEL INJECTION PUMP IDLER GEAR Remo
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TIMING GEARCASE 853, 853H BICS Serv
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CAMSHAFT (Cont’d) Camshaft Bearin
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OIL PAN Removal Remove the oil drai
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OIL PUMP (Cont’d) Checking (Cont
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WATER PUMP Removal and Installation
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WATER PUMP (Cont’d) Assembly (Con
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WATER JACKET TUBE Removal and Insta
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SYSTEMS ANALYSIS Page Number BICS S
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BOBCAT INTERLOCK CONTROL SYSTEM (BI
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BICS SYSTEM CONTROLLER (Cont’d) C
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SEAT BAR SENSOR (Cont’d) Seat Bar
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SEAT SENSOR (Cont’d) Seat Sensor
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LIFT LOCK BY-PASS VALVE Removal and
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TILT LOCK VALVE Removal and Install
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BOSS® DIAGNOSTIC TOOL Procedure Th
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SERVICE CODES (Cont’d) The follow
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TROUBLESHOOTING THE BOSS® & LCD DI
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BOSS® INSTRUMENT PANEL Removal and
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PWM MODULE (Cont’d) Description (
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PWM CONTROL HANDLE Handle Testing T
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SPECIFICATIONS Page Number DECIMAL
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LOADER SPECIFICATIONS LOADER DIMENS
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ENGINE SPECIFICATIONS All dimension
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ENGINE SPECIFICATIONS (Cont’d) Al
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TORQUE SPECIFICATIONS FOR LOADER Sp
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HYDRAULIC/HYDROSTATIC FLUID SPECIFI
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DECIMAL AND MILLIMETER EQUIVALENTS
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AFFECTING: Product BOBCAT LOADER Mo
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AFFECTING: Product BOBCAT LOADER Mo
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TAKE OUT PUT IN 853 BICS - OPERATOR
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