Allis Chalmers Model 616 620 720 Tractor service repair manu

:.:.:. :.::.: .:.: ::: ... ::::::::"'1::::1:1:::,::::1:: •• This manual covers the following equipment: Mfg. No. 1690073 1690231 1690288 2020185 2020303 2020304 Description Model 720 Tractor (Allis Chalmers) Model 720 Tractor (Allis Chalmers) Model 720 Tractor (Allis Chalmers) Model 616 Tractor (Allis Chalmers) Model 620 Tractor (Allis Chalmers) Model 620 Tractor (Allis Chalmers) Repair Manual Allis Chalmers Model 616, 620, & 720 Tractors (NOTE: This reprint contains all of the previous Volume 1 & Volume 2 in this one book.) TP 500-050~-Ol-PM-SA

Thi!S Pa.g~ i!S Bla.nk

Table of Contents General Information BATTERY CARE ............................................................................... 1-1 BATIERY REMOVAL AND INSTALLATION ........ • .................... •..• ............. 1-1 WATER LEVEL ......... •.•..•• .... • ....... •• .... •• .... • ......... • ..................... 1-1 CHARGING ................................ ~ •..• ......... • .......................... •. 1-2 WINTER CARE .................................... • .... •• .......................... •.. 1-2 BEARING CLEANING AND INSPECTION ...................................................... 1-2 CLEANING ................... •. 0 ••••••••••••••••••••••••• 0.0 ••• 0 0 •••••••• 0 •••••••••• 0 1-2 INSPECTION .............. • ......... • 0 ••••••••• 0 ••• '0' •••• 0 0 ••••••••••••••••••••••• 0 ••• 1-2 PRESERVATION ............ •..• ..... ••.••• ..... ••. 0 •• 0 ••• 00 ••••••••••• 0 •••• 0 ••••••••• 1-3 TORQUE SPECS. FOR HARDWARE ..••.•..• 0 • 0 ••••••••••••••••••••••••••••••••••••••••• 1-3 VISCOUS COATING VC-3 .... 0 •••••••••••••••••••• 0 •••••••••••••••••••••••••••••••••••• 1-4 DRYING ............... •.•..• 0 •••• '0' •••••••• 0 •••••••••••••••••••••••••••••••••••••••• 1-4 TRANSMISSION FLUID AND FILTER .......................................................... 1-4 TRANSMISSION PRIMING PROCEDURE .•.•..• ..... •...•.••...• .... • ................ •.• 1-4 BRAKE ADJUSTMENT . ... : .................................................................... 1 -5 CLUTCH PEDAL FREE TRAVEL ADJUSTMENT . ................................................ 1-6 CLUTCH BELT TENSION ... .................................... 0 ••••••••••••••••••••••••••••••• 1-6 REPLACEMENT PARTS ....... 0 ••••••••••••••••••••••••• 0 •••••••••••••••••••••••••••••• 1-7 Tractor Repair ENGINE .................................................................... o •••••••••••••••••• 1-9 DESCRIPTION ..... •• ......... • ...... ••..• ......... ••• .................. •.. 0 • 0 •• 0 ••••• 1-9 ENGINE REMOVAL • .............. •..•••.•. '0' 0 ••••••••••••••••••• 0000.00 •••••••••••••• 1-9 ENGINE DISASSEMBLY, REPAIR, AND ASSEMBLY. 0 0 ••••••••••••••••• 0 •••••••••••• 0 •• 1-11 ENGIN E INSTALLATION ............... • .... • ..... • ..... •. 0 • • • • • • • • • • • • • • • • • • • • • • • • •• 1-11 WHEELS AND DROP HOUSINGS . ......... 0 •••••••••••••••••••••• 0 ••• 0 ....................... 1-12 REMOVAL AND INSTALLATION OF WHEEL • ......... •.• .... ••..• .... •...• ..... • ...... 1-12 REMOVAL AND DISASSEMBLY OF DROP HOUSING .•..• ........ •...• .... •...•... 0 ••• 1-12 INSPECTION AND REPAIRS OF DROP HOUSING •••• .... • 0 •••••••••••••• 0 ••••••••••••• 1-13 ASSEMBLY AND INSTALLATION OF DROP HOUSING .... •.•...• o •••••••••••••••• 0.0 •• 1-13

(Contents Continued) Tractor Repair BRAKES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 1-14 DESCRIPTION .................. ••..• ..... •..• ........... • .............. • .......... • 1-14 OPERATION ....... •...• ...... •.•...•...•••••• .......... •• ............. •• ...... •.•.. 1-14 REMOVAL AND DISASSEMBLY OF BRAKE ASSEMBLY •.•..••..• ......... • .... • ....... 1-15 DISASSEMBLY OF BRAKE LEVERS AND LINKAGE ......... •.•.• .......... • ........... 1-16 INSPECTION AND REPAIR ...• ....... •.••••.•.•• .......... •.• ..... • ..... •••...•••...• 1-16 ASSEMBLY OF BRAKE LEVERS AND LINKAGE ..• ........... • ..... •.•..•••.•.•.•••.•• 1-16 INSTALLATION AND ASSEMBLY OF BRAKE ASSEMBLy ...... • ..... •.••.•• .... •• ...... 1-16 POWER TRAIN SYSTEM .. ............................ _ ....................................... 1-18 DESCRIPTION .• ..... • .... ••...•...• .... • ...... •...• ...... • ........ •.• .... •• ...... •. 1-18 OPERATION •.. . . . . . • . . . . . . . . . . . . . . . . . . • . . . . . . . • . • • • . • . . . . • . . . • • • • • • . . . . . . • . . . . . . . .. 1-18 1. CLUTCH .. . . . . . . . . . . . . . • . . • • • • . . . . . . . . . . . . • • • • . . • . . . • . • • • • . . • . . . . . . . • . . . . . • •. 1-18 2. HYDROSTATIC TRANSMISSION. . . . . . . . . . . • . • . • . . • . . • . • • • • . . . . . . . . . • . . . . . . . • .. 1-18 3. TRANSMISSION ...... •..•.• ............... •.•••••••..••• ........ •..•••...•.. 1-19 4. DI FFERENTIAL . • • . . . • • • . . • • . . • . • . • • • • • • • . . . . • • • • • • • . . • • . • . . . • . . . • . • • . . • . . . • .• 1-21 5. REAR PTO ............... •...•••..•••.•• ....... •.••.••• ..... ••..•••...••••.•• 1-21 CLUTCH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 1-23 CLUTCH DISASSEMBLY ................ •• .... •.•..• ........ • ..... ••••••...•.• ....... 1-23 CLUTCH INSPECTION, CLEANING, AND REPAIR .... •••..• .... • .... • .... • .... • ....... •. 1-24 CLUTCH ASSEMBLY ..•.••.•.••..••...•...• ........ •••..•.•...••• ......... •• ...... •. 1-24 DRIVE SHAFT ............................................................................... 1-24 DRIVE SHAFT REMOVAL. • • . • • . • . • . . • • • . . • . • . • • . . . . . . . . . • • . • • • . . . . . . . . . . . • . . . . • . • • .• 1-24 DRIVE SHAFT INSTALLATION •..• ....... •.•••.• ............. ••• ..... •...•••...••••.•. 1-24 TRANSMISSION . ............................................................................ 1-25 TRANSMISSION REMOVAL AND DISASSEMBLY .... •• .... • ..... ••••••••..••..•..•..•. 1-25 INSPECTION, CLEANING, AND REPAIR OF BEVEL GEAR TRANSMISSION •• .- ................................................ 1-29 TRANSMISSION ASSEMBLY •••.••• .... • .... ••.• ....... •.•••.••••...• .... •••..•••.••. 1-29 TRANSMISSION INSTALLATION ..... •.••••.•.•• ....... •...•.•• .... ••••.••••.•••••..• 1-31 DIFFERENTIAL .............................................................................. 1-32 DIFFERENTIAL REMOVAL AND DISASSEMBLY ...••••••••..••.•••••• .... •.•••.• ..... • 1-32 INSPECTION, CLEANING, AND REPAIR OF THE DIFFERENTIAL •••••••...•.•.••.•••.•••. 1-32 DIFFERENTIAL ASSEMBLY AND INSTALLATION •.•••••••.•••••••...•.•.•.••..•••••••• 1-32

(Contents Continued) Tractor Repair REAR PTO .............. .. " ................................................................. 1-34 DESCRIPTION .................... • ...... •••••• ......... ••• -.......... ••.•• .... •.•..• 1-34 PTO DRIVE UNIT REMOVAL • ........ •..• ........ •••••.••...••• ...... •..•••...••••... 1-34 PTa DRIVE UNIT DISASSEMBLY. . . . • . . . . . • • • . . . . . . . . . . . • . • . . . . . . • . • . . . • . . • . • . . • . . . •• 1-35 PTO DRIVE UNIT INSPECTION ....... ••••...• .... ••.••••..•..•..• ....... ••••...•.•... 1-36 PTa DRIVE UNIT ASSEMBLY .... ••.• ...... •..•• ....... •• ............ •• ...... ••.•••.. 1-37 PTO DRIVE UNIT INSTALLATION ...... • ..... •• ..... • ..... ••• ..... ••• ..... ••.•..•.•.•• 1-37 REAR PTO DRIVE UNIT KIT .•.•• ...... •••••..••..•.••••••...••• ...... •..•..•.••.• .... 1-38 FINAL DRIVE . ............................................................................... 1-38 DRIVE SHAFT ASSEMBLY REMOVAL AND INSPECTION. • • . • • • • • • • . . . . . . . . • • • . . • • • • . .. 1-39 INTERMEDIATE GEAR ASSEMBLY REMOVAL AND INSPECTION ...••.•...•.•.•.•.•.•.• 1-39 FINAL GEAR ASSEMBLY REMOVAL AND INSPECTION •••.••••••.•••..•...••.• .... •.•• 1-40 FINAL GEAR ASSEMBLY INSTALLATION •.••..••••••.•.••...••• ..... •• ..... •..•.• .... 1-40 INTERMEDIATE GEAR INSTALLATION • .... •.•..• ..... ••..•• ...... ••••.••.••.•••...••• 1-42 DRIVE SHAFT ASSEM BLY INSTALLATION • ...... •••••••••..•••••• .... • .... •.•.••.•.•• 1-43 TRANSMISSION PRIMING PROCEDURE .•••••.••.• .... •..•..• .... •..••...•••..••• .... 1-43 STEERING AND FRONT AXLE ASSEMBLIES . ................................................ 1-44 DESCRIPTION ..... •.•.•..•••• ..... •.•••••.•••••••• .... • ....... •...••..••••..•.••.•. 1-44 STEERING GEAR REMOVAL ..... •..• ...... •••.• ..... ••..•••...•.•..•...•.•.•• .... ••• 1-44 STEERING GEAR DISASSEMBLY. . . . . . • • • • • . . . . . . • • • . • • • • . . . • • • • • • • • .• • .••.• .... •.•• 1-47 STEERING GEAR INSPECTION .••••.•..•..•••.•••••...••.• .... ••• .... •..•..•..••••... 1-48 STEERING GEAR REPAIRS ..•...• .... •.•...••...• .... ••.•••• .... •••.•.•..•••.•.•.••• 1-49 STEERING GEAR ASSEMBLy ••.•.•.•••••••...••••••••.••..•••••.••..•••.•••..••..••. 1-51 STEERING GEAR BENCH ADJUSTMENT ...•••••• ......... •• ......... ••...•.• .... ••... 1-53 STEE RI NG GEAR INST ALLATfON . . . . . . . • . • • . . • . . . • . . . • • . • . • • . . . • • • • • . . • . . . • . • • • . . . • •• 1-53 STEERING SHAFT REMOVAL, rNSPECTION, AND INSTALLATION .•• .... ••.••••..••••..• 1-54 DRAG LINK REMOVAL, INSPECTION, INSTALLATION AND ADJUSTMENT •.•..• ....... ••.•.•...• ' ..•••••.••..•••••••••.•••.••••••...••. 1-56 TIE ROD REMOVAL, INSPECTION, AND INSTALLATION •..••...•.• .... •••.••.•..••••..• 1-57 HUB REMOVAL, INSPECTION, AND INSTALLATION •••••••..••.•••••..•.•..•.• ..... ••. 1-57 SPINDLE REMOVAL, INSPECTION, AND INSTALLATION .••...•••••.••..•..•••• ..... ••• 1-58 FRONT AXLE REMOVAL, INSPECTION, AND INSTALLATION •• ........ •..••.••..•••.•.. 1-59 This notation preceding Cautions and Warnings in the text signifies important precaution- ary steps which. if not properly followed could result in personal injury or damage to your equipment affe'Cting safety.

Table of Contents Tractor Repair POWER LIFT SYSTEM . ........................................................................ 2-1 DESCRIPTION .•••.• ...... •.• ..... •..• ........ • ......... •• ............ •.••.•.•.•.••... 2-1 FUNCTION .••..•.••... ~ ..•.•..•...• ..... •••...•..• ...... ••..•..•.• .... ••••••••.••••..• 2-2 HYDRAULIC CONTROL VALVE REMOVAL AND INSTALLATION ••••...••..• ...... ••...••.. 2-2 HYDRAULIC CYLINDER REMOVAL .• ...... ••..••.•• ...... •••.••••.•••.•••..• ...... ••... 2-6 HYDRAULIC CYLINDER INSTALLATION •...••.•••.•••••...••.••••..••••••...•..•••.• .... 2-6 OIL COOLER REMOVAL, INSPECTION, AND INSTALLATION •.•••••••••••••• ...... •.••.••• 2-6 ELECTRICAL SYSTEM . ........................................................................ 2-7 DESCRI PTION .• .... • 0 ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 2-9 GENERAL CHECKOUT PROCEDURES •••••.•.•••••.••••••••••...•..• ...... ••.•.•• .... •.. 2-9 WIRING HARNESS ........ •• .... •••.••••...••••••...••••••• ............ ••.•••••..•••.. 2-9 BA TIERY CIRCUIT ••.•...•••..•.•••••.•••..•••••••.•.•• ' ••••.•.• ....... ••••.••••...•• 2-11 BATIERY CONDITION .•.•••••.•.••.••••••.••..••• .... ••••••.•••..•..•.••••••.• ...... 2-11 BA TIERY WI RING •••..••.••••••.•...••••••••.••• .... ••.••••••.•...•.•.• '. • • • • • • . . . • •• 2-12 CHARGING CIRCUIT ........................................................................ 2-13 DESCRI PTION .•.•••.•••••.••••••...•.•.•••.•.••••...•..•..•••••••••••••..•..•••.••. 2-13 CHARGING CIRCUIT CHECK •.•.•..••• .... ' ••.•••.•••••.•..•.•••••••••••••.••.•.••.••. 2-15 NO CHARGE TEST ...••.• .... ••.••••..•..••.•••••••••••..••••••••••••.••••..••••.••. 2-15 HIG H CHARGE RATE TEST .•...•.•.••.••.•••••••••••••..•••••••.•••.•••.•••...••.•.. 2-15 FLYWHEEL STATOR CHECK . . . . . • • • • • • • • . • . • . • • • • • • • • • • . . • • • • • . . . • . . • • . • • • • • • . • . • . •. 2-15 IGNITION CIRCUIT .......................................................................... 2-16 DESCRIPTION ..••.• .... •••••.•.••..••••...••••••..•••••••••..•.•• ..... •••••••••••.. 2-16 IGNITION CIRCUIT CHECK .•••.•..•..•••••...•••••..••••••••••.•..• .... ••••••.•...••• 2-16 SPARK PLUGS .••••••..•••••.••...••..•.•••..••• ..... ••.••.••.••..•••••..••••••...•• 2-16 BREAKER POINTS AND CONDENSER .......................... ',' ..•••••..••..••..••• 2-16 COIL . • • • • . . . • • • . . • • • • • • • . . • . . . • . • • . . . . • • • • . . . • • . • . • • . • . • • • • • • • • • . • • • . • • . . • • . . • . . . •. 2-17 WIRING CIRCUIT .... ••••••...•.••••••...•••.•.•••••.•...•.•.••••••.•.••..•• .... •.•.. 2-17 STARTI NG CI RCUIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 2-17 STARTING CI RCUIT CHECK. . • • . . • • • • • • • • . . . • • . . • • • • • • • . • • • • • • • • • • • • • • • . • • • • . • . • • • • •. 2-17 BATIERY AND BATIERY CiRCUiT ••..••••..••••..•••••••..••••••.••...•.••••••.••.•.. 2-17 WIRI NG CIRCUIT. • • • . . • . • • . • • . • . • . . . • • • • • . • • • • • • • • • • • • • • . • • • • • • • • • . . . • . • • • • • • . • . • . .. 2-17 IGNITION CI RCUIT •••.•.•••••••..•..•••••...••••••••••.••••..•...••..•.••••••••.••.. 2-17 PTO SWITCH ..•.••..•••.. " •.•• .... •.••••.. " •.••••.•.•••••• .......... ••••.•••.•.•.•• 2-19 TRANSMISSION NEUTRAL START SWITCH ADJUSTMENT ••••..••..•.•..••..•••.•••.•• 2-20 WIRING CIRCUIT CHECK •• "0 ••• " ••••• "" •••••••••••••••••••••••••••••••••••••••••••••• 2-21 ENGINE CRANKING REQUIREMENTS •...•..•.•••••••...•.••..••••..••••.•..••..•••••• 2-21 STARTING MOTOR AND SOLENOID CONDITION •••••••.•.••.•••••••••••.•••••..•••••. 2-21 LIGHTS AND HOURMETER CiRCUiT .................................................. ...... 2-21 LIGHTS AND HOURMETER CIRCUIT CHECK ..•••••.••..••.•••••••••••••••••••.••••••.. 2-21 BATIERY AND BATIERY CiRCUiT .•••..•.• .... ••• ..... ••..•••••...•..•••••••••.•••... 2-21 CHARGING CIRCUiT.. . . • . . • • • . . • • • • . . . • . . • • . . . • • . . . . . • • • • • • • • • . . . • . . . • • . . . • • • • • • • • •• 2-21 WIRING CIRCUIT .•• ....... •••...••••...••••..••• ...... •• ......... •.•.••.•.•.•.•...•• 2-21 IGNITION SWITCH •••.••...•..•••••••..•.••...•• ...... •.••..•.. " .................... 2-22 LIGHT SWITCH .•••••.••••••.••.•...•.••.••.•.•..•••..•.•...•.•.•.•••••••.•...•..••. 2-22 WIRING CIRCUIT CHECK •••••••..•..••••..•.• .... •••..•.•..••.••..•••••••••...••.••. 2-22 LIGHTS AND HOURMETER ••••• ..... •.••..•••••.•••••••••..••.•••.•••••••••••.•••••• 2-22

(Contents Continued) Tractor Repair PRESSURE AND TEMPERATURE SENDING UNIT CiRCUiT ....... • ........................... 2-22 PRESSURE AND TEMPERATURE SENDING UNIT CIRCUIT CHECK .... •••• ....... •.•.•.. 2-22 BATTERY AND BATTERY CiRCUiT ••• ....... •..••.••...• ..... •..•...•.••...•...••••... 2-22 CHARGING CiRCUiT ...•...•..•.•.• ....... ••••...••• ........ ••.•• .... ••...• .......... 2-22 WIRING CIRCUIT .... • .... •.•..•.• ........ ••• ..... • ...... •..••..•.• .... ••••...•.• .... 2-22 IGNITION SWITCH ............. •.• ......... • ..... •••.••• ...... • ......... •• ..... • .... 2-22 WIRING CIRCUIT CHECK ........ • ....... •.•• ..... ••••••.• ...... • ........ ••.••..• .... 2-23 WARNING LIGHTS ............ •..•...•• .............. ••••..• .......... •..•.•• ....... 2-23 SENDING UNITS ......... • .......... ••••• ..... ••..•.•...•• .............. •...• ..... •• 2-23 PTO CIRCUIT ................................. • .................... • ........ •.• .............. 2-24 PTO CI RCUIT CHECK . . . . . . . . • • . . . . . • . • . • . • . . . • . . • . . . . . . . . . • • . . . . . • • • • • . • . . • . • . • . • • .. 2-24 BATTERY AND BATTERY CiRCUiT ••.•.•...••.••..••...• ..... ••...••.•• ......... •.•... 2-24 CHARGING CIRCUIT ...• ..... ••..•..• ..... •••• .... • ......... •..••.••...•• ..... •• ..... 2-24 WIRING CIRCUIT • ...... ••..•..•.•.•• ...... ••• .... •.•.• ...... •••••.•.••.•.• .... •.•... 2-24 IGNITION SWITCH .... • ..... •..•.•••..• .... •• ..... ••••..•..•••••..•.• .... • ..... • .... 2-24 PTO SWITCHES ...• ...... •..•.•.•• .... •..• ........ •••••••...•.••..• .... ••• ..... • .... 2-24 WIRING CIRCUIT CHECK ...... ••••..•.•.• ...... •..••••••••..•••...•.•.•.••..•.•••... 2-24 ELE-CTRIC CLUTCH ..• .......... • .... •.•.• ...... •..•.••••••.•• ......... •.••.•.•.• .... 2-25 REMOVAL AND INSTALLATION OF ELECTRICAL COMPONENTS .•..• ............ • .......... 2-25 STARTER AND FLYWHEEL REMOVAL ......................................... - ••. ° 0 ••• 2-25 INSTRUMENT PANEL COMPONENT REMOVAL. .•.• ..... ••.••• .... • ..... •..•.••..•.••. 2-25 FRONT PTO CLUTCH REMOVAL ..................................................... 2-26 FRONT PTO CLUTCH INSTALLATION ................................................. 2-26 CIRCUIT BREAKER REMOVAL AND INSTALLATION .................................... 2-27 FUSE REMOVAL AND INSTALLATION ................................................ 2-27 TRANSMISSION NEUTRAL START SWITCH REMOVAL AND INSTALLATION •• ..... •••• .... • ...... •.••...•••.• ........ ••..•.•. 2-27 LIGHT REMOVAL AND INSTALLATION ............................................... 2-28 SENDING UNIT REMOVAL AND INSTALLATION .... •.•...•...•••••••..•..•.•...•.••••. 2-28 TROUBLESHOOTING GUIDE ......................... •••..••• ............... • ........... • .... 2-29 SPECIFICATIONS ........................... • ..... • ...... ••• ........... ••..••...• ............ 2-30 FUEL SYSTEM ......................... • ....... •...•...•.• ....... • ...... •.• ...... • ........... 2-31 DESCRIPTION ...••.•...•••••••• .... ••• .... •.• .... ••••..•..•.•.••.••..•.••..•..••••. 2-31 SYSTEM OPERATION ...• .... ••.•..••.••• .... •.•...•••••..••.••• ...... •.•..• .... ••.. 2-31 FUEL TANK AND FUEL GAUGE REMOVAL, INSPECTION, AND INSTALLATION .... •.•..•••..•.•..••.••...•...••..••.•.•..•.•••..•••..• .... 2-32 AIR CLEANER REMOVAL, CLEANING, AND INSTALLATION •• .... ••• ..... •••.• ......... 2-32 FUEL LINES AND FILTER ............... •••.•• .... ••...•..•..••.•..•• .......... • ..... 2-35 FUEL PUMP, CARBURETOR, GOVERNOR, MUFFLER, ETC .••.•• ........ •• .... •..•.•.•.. 2-36

(Contents Continued) Tractor Repair IN-LINE HYDROSTATIC UNIT . ............................................................... 2-37 SPECIFICATIONS ..•••.•.•• .... ••• ...... •...••••..••••••..•.•••..•.•...•.•.•...• .... 2-37 HYDRAULIC FLUID RECOMMENDATIONS •••.••.•.•.• .... ••.•••.••••.••.• ............ 2-37 SYSTEM DESCRIPTION •..•.•...••• ........ •••.••..•••.••••• .... ••..•..••••••.••• .... 2-38 PUMP IMOTOR •.•.• ..... ••...••••.••••••.•.•.•.•..• .... ••.•..••• ....... ••• ..... 2-38 CHARGE PUMP AND CHECK VALVES ............................................ 2-38 CONTROL ..•.••.•••.•...••.•.••••••••.••.••••••• ......... ••••••••••••...• ...... 2-38 IMPLEMENT RELIEF VALVE .•••.• .... •.••••..••••••• .... •••••••••..••••.•.• ...... 2-39 ACCELERATION VALVES ..•• .... • .... ••••••••••.• ..... ••••.•..•..••••..••.• ..... 2-39 TESTING ...... •..•.••• ...... •...•...• ...... ••.••.•••..•.••...•..•••.•.•••..•..•••.. 2-41 GENERAL .... •••..•.••••.•..•••.•.••••••...••...•••••••.••.•••••••••.••.••..••. 2-41 TEST PROCEDURE •.••..••..••..••..•.•••••••••••..•...••..••.••..••.•...••.•..• 2-41 TROUBLESHOOTING ...••••••.•.••••.•••••.•••.••••..•••••.••...•.••.•.••..•.•••.•.• 2-43 REMOVAL AND INSTALLATION ••••..••..••.••.•••...•.•..•..•.•..•.••.•••••.•.•.•... 2-45 GENERAL ..•...•..••••.•••••.••.•.••.•••...•••••••••••..••.•••••..•...•.•..•..• 2-45 REMOVAL .•...••••••.•.••.•••.•..•...•...•••...•••..••.•••.•.••..•••••••.••••.. 2-45 INSTALLATION .... •••••.••..•••.••••••••..•••••••••••.•••••••••••.••.•.•.••••.. 2-47 DISASSEMBLY, REPAIR AND REASSEMBLy .••••.••...•..•••...•.•••.•.•••••••..•..•• 2-49 GENERAL •.•••..•••••••••...•••.•••••••••.•••.••••••••...•.•••••• .... ••••.•.••. 2-49 CHARGE PUMP ...• .... •.•...••••.•••••••.•••••.•••••.••..••••••.•..•••.•.•• 2-49 CHARGE RELIEF VALVE ...••.•••••••••..••••.••••••••••••••••.••..•.•..•.••• 2-50 IMPLEMENT RELIEF VALVE •..•••••.•••••.•• .... ••• .... •.•.•..••••••••.•••.•. 2-51 ACCELERATION VALVES .•••.••••••.•.••••••••••.••...•••••.••.•..•••..•••.. 2-51 SHAFT AND TRUNNION SEALS ...••.•••..•..•..•.••.•.•.••••.•.•.••. '" ...•• 2-51 MAJOR DISASSEMBLY AND REPAIR ............................................. 2-51 SEPARATING THE (3) MAIN SECTIONS ••.••••...• ...... ••..•.•••••••.•••••.•• 2-51 MOTOR SECTION .•••••.••••.••.•••.•..•••••.•••••.•.•••••••...•...•..•••••. 2-51 PUMP SECTION .•.•...•••••••• .... •.•••.•••••••••••.•..•••••••.•••.•.••..•.. 2-53 CENTER SECTION ••••••..•••••••••••••••••.•.•.••••.••••••.••.••..••.•••••.• 2-54 REASSEMBLY •••..•..•...••••..•...•..••••.•.•••••••...•.•••.•.••.•.•.••.•.•••. 2-55 MOTOR SECTION ••••.•.•.••.•••••••••••••.•.•••••••.••••••.•••...•.•.•••••• 2-55 PUMP SECTION .•.•..••.••..•...•••••••••.•••..••••• ' •.•••.••.••.••••.••.•••• 2-55 CENTER SECTION ..•.••..••••••••••• ..... ••••••.•••••••••••.••.•••.•••.•.•.• 2-56 REASSEMBLING (3) MAIN SECTIONS ••••.••• ..... •.•.••••.•.••.••••••.•••... 2-56 PRIMING PROCEDURE •••••..••••.•••••••.•••••••••••••.••••••••••.••.•••.•••... 2-57 TESTING AFTER REPAIR .... ••••..•••.•••..••••••.• ...... ••••••..••••••••••.•.••.• 2-57 EXPLODED VIEW ••••••••••..•••••••••••••.•••••••••.••••••••••••••.•••••.••••.• 2-58 PARTS LIST ••••••..••..••••••..•.•.•••..•••..•.•..•...••••••.•.•••••••••.••..•. 2-59 A This notation preceding Cautions and Warnings in the text sigmlies important precaution- ary steps which if not properly followed, could result in personal injurv or damage to your equipment affecting safety.

Safety Rules Attention Repair Personnel: As repair personnel you have an obligation to know the product completely. This includes safety related. aspects as well as the mechanical know-how. Before beginning repair, thoroughly familiarize yourself with the Operator's Manual for the product, paying part:cular attention to the safety warnings it contains. During repair it is possible to place yourself in a position which is more hazardous than when the unit is in full operation. Remember, it is your responsibility to repair a unit safety and then to be sure the unit is·safe before it is again put into operation. Preparation • Read the Operator's Manual for the Repair unit being repaired and the safety rules in this manual. Be thoroughry familiar with the controls and safe use of the unit. • Keep the repair area clear of alt per- sons, particu tarly small children, and pets. • Have a clean, well lighted, ventilated area for repair work. • If a unit is to be lifted vertically for repai r, follow the proper procedu res for raising the unit given in this manual. If you do not have the proper lifting equipment, do not attempt to raise the tractor. • Stop the engine, set the parking brake, and remove the key before working on a unit. • Remove the spark plug wire and negative battery ca ble and fasten them away from any metal when working in the engine area. • Block the wheels if a unit is. to be jacked up and use jack stands. Never trust the jack alone to hold a unit. • Always wear heavy footwear and proper clothing. Never start or test run a power unit when wearing sandals or canvas shoes. During testing or adjustment never work near moving parts or wear loose fitting clothing. • Never allow a child or inexperienced person to attempt the repair of a power unit. • Follow all repair instructions in the exact order given in this manual. • Handle gasoline with care - it is highly flammable. Your gasoline supply and any gas drained from a unit should be in approved containers. • Check all nuts, bolts, and screws for tightness when repai r is complete. • After repair make sure: a. the unit is in operating condition, b. all safety devices and shields are in place and in working order, and, c. aU adjustments have been made. --------------------------------------- Test Operation • Always follow the proper starting procedures for each unit as given in the Operator's Manual. • If power unit starts to vibrate during testing stop the engine immediately. Check and correct the cause before restarting the engine. • Be prepared for possible hazardous movement of the power unit or unit parts when testing the interl'ock and other safety device systems. • Do not changeengine governor settings or overspeed the engine. • Never attempt to adjust any power unit while the engine is running. • Keep hands and feet clear of alJ moving parts. • Never test run a power unit indoors without a proper exhaust ventilation system and then only for short periods. Exhaust fumes are deadly. • Be especially careful not to touch parts which might be hot from operation. Allow such parts to cool before readjust- ing or servicing. • Never remove the fuel tan k cap or add gasoline to a running or hot engine. Wipe up spilled gasoline.

Battery Care General Information BATTERY CARE Battery Removal and Installation (Figure 1) 1. Open the tractor hood, disconnect the battery cover attaching springs, and remove the battery cover. A WARNING The positive battery terminal can be easily shorted to the tractor frame by a metal tool. To avoid this prob- lem, always disconnect the negative cable first and connect it last. 2. Remove the plastic caps from the battery terminals. Disconnect the battery cables, negative cable first, by removing the two capscrews securing the cables to the terminals. 3. Loosen the capscrews that secure the battery clamp and carefully remove the battery. 4. To install the hattery, follow the battery removal procedure in reverse order. Make cer- tain the positive cable is connected first. Check the condition of the cables and replace them if necessary. Water Level The battery water level should be checked every 25 hours of operation. Remove the battery cover and all battery caps, and check that the water level is up to the marking ring. NOTE Do not allow the water level in the battery to fall below the top of the plates. Fill each battery cell to the marking ring with distilled water. If distilled water is not available, clean tap water may be used. Before replacing the battery caps, make sure the vent holes are free of dirt and grease. Make sure that the entire top of the battery is clean. ,\:+4 --BATTERY COVER HINGE ASSY. SHOULDER BOLT Figure 1. Battery Removal and Installation 1-1

Allis Chalmers Model 616 620 720 Tractor service repair manu

You're Reading a Preview

Recently Viewed