Case 621C User manual

621cn21 c Loaders
Service Manual
Table of Contents
General
SectionIndex- General
StandardTorqueSpecifications
FluidsandLubricants
LoctiteProductChart
Engines
SectionIndex- Engines
Description
EngineandRadiatorRemovalandInstallation-621C
EngineandRadiatorRemovalandInstallation-721C
StallTests
ForEngineRepair,SeetheEngineServiceManual
FuelSystem
SectionIndex- FuelSystem
ForFuelSystemRepair,SeetheEngineServiceManual
Electrical
SectionIndex-Electrical
RemovalandInstallationofStarterandAlternator- 621C
RemovalandInstallationofStarterandAlternator-721C
ElectricalSpecificationsandTroubleshooting
Batteries
StarterandStarterSolenoid- 621C
StarterandStarterSolenoid-721C
InformationandDiagnosticCenter
Alternator
Steering
SectionIndex- Steering
RemovalandInstallationofSteeringComponents
SteeringSpecifications,PressureChecks,andTroubleshooting
SteeringControlValve
SteeringPriorityValve
SteeringCylinders
CenterPivot
CASE CORPORATION
700 State Street
Racine,WI 53404 U.S.A. Bur?-12113
SectionNo.
Tab1
1001
1002
Tab2
2000
2000
2002
Tab3
Tab4
4001
4001
4002
4003
4004
4004
4005
4007
Tabs
5001
5002
5003
5004
5005
5006
FormNo.
7-12120
8-71601
7-12131
8-98902
7-12140
7-12150
7-12160
7-12171
7-12180
7-12190
7-12210
7-15380
7-12221
7-49440
7-12230
7-12240
7-12251
7-12260
7-12270
7-12290
7-12300
7-12310
7-12320
7-12330
7-12340
IReprintedI
© 2001 Case Corporation
Printed in U.S.A.
December, 2001

Description
SectionIndex- PowerTrain
Transmission-621C
621C FrontandRearAxle- 721C RearAxle
621cn21 c Loaders
Service Manual
Table of Contents
DriveShaft,CenterBearing,andUniversalJoints
TransmissionControlValve
Brakes
RemovalandInstallationofBrakeComponents
BrakeAccumulators
BrakeAccumulatorValve
NOTE: Forparkingbrakeandbrakepedaladjustments,seeSection9001.
Hydraulics
RemovalandInstallationofHydraulicComponents
CleaningtheHydraulicSystem
LoaderControlValve
CouplerLockValve
CombinationValve
SolenoidValveandAccumulatorValvefor RideControl
Bur?-12113
SectionNo. FormNo.
7-12362
6003 7-12401
6004 6-41400
6005 7-12430
6007 7-12450
Tab7
7001 7-12480
7004 7-12510
7007 7-12530
Tab8
8001 7-12571
8003 7-49640
8005 7-12611
8007 7-12630
8011 7-12650
8014 7-13480
Issued 12-01 Printed in U.S.A.
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MountedEquipment
PedalsandLevers
AirConditionerSystemService
Description
621cn21 c Loaders
Service Manual
Table of Contents
AirConditioningCompressorandClutchForSystemswithHFC-134aRefrigerant
ROPSCabandROPSCanopy
621C- HydraulicSchematicFoldoutandElectricalSchematicFoldout
SectionNo.
Tab9
9001
9003
9005
9007
InRearPocket
NOTE: Case Corporation reserves the right to make improvements in design or
changes in specifications at any time without incurring any obligation to install
them on units previously sold.
Bur?-12113 lsssued 12-01
FormNo.
7-12670
7-14160
7-14180
7-12690
7-12721
Printed in U.S.A.
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SECTION INDEX - GENERAL
Section Title
Section Number
StandardTorqueSpecifications.................................................................................................................................. 1001
FluidsandLubricants............................................................................................................................................... 1002
LoctiteProductChart
CASE CORPORATION
700 State Street
Racine, WI 53404 U.S.A.
CASE CANADA CORPORATION
3350SOUTHSERVICEROAD
BURLINGTON,ON L7N3M6 CANADA Bur 7-12120
© 1999 Case Corporation
Printed in U.S.A.
April, 1999
Find manuals at https://best-manuals.com

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Section
1001
STANDARD TORQUE SPECIFICATIONS
CASE CORPORATION
700 State Street
Racine, WI 53404 U.S.A.
CASE CANADA CORPORATION
3350South Service Road
Burlington, ON L7N 3M6 CANADA RacS-71601
© 1994 Case Corporation
Printed in U.S.A.
Issued November, 1991
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1001-2
TABLE OF CONTENTS
TORQUE SPECIFICATIONS - DECIMAL HARDWARE ......................................................................................2
TORQUE SPECIFICATIONS - METRIC HARDWARE ........................................................................................3
TORQUE SPECIFICATIONS - STEEL HYDRAULIC FITTINGS .........................................................................4
TORQUE SPECIFICATIONS - STEEL HYDRAULIC FITTINGS .........................................................................5
TORQUE SPECIFICATIONS - DECIMAL HARDWARE
Use the torques in this chart when special torques
are not given. These torques apply to fasteners
with both UNC and UNF threads as received from
suppliers dry, or when lubricated with engine oil.
Not applicable if special graphities, Molydisulfide
greases, or other extreme pressure lubricants are
used.
Grade5Bolts,Nuts,andStuds
Rae8-71601
Grade8Bolts,Nuts,andStuds
0
Issued11-91
Retyped November,
PrintedinU.S.A
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1001-3
TORQUE SPECIFICATIONS - METRIC HARDWARE
Use the following torques when specifications are
not given.
These values apply to fasteners with coarse
threads as received from supplier, plated or
unplated, or when lubricated with engine oil. These
values do not apply if graphite or Molydisulfide
grease or oil is used.
Grade8.8Bolts,Nuts,andStuds
Rae8-71601
Grade10.9Bolts,Nuts,andStuds
Grade 12.9 Bolts, Nuts, and Studs
Usually the torque values specified for grade 10.9
fasteners can be used satisfactorily on grade 12.9
fasteners.
Issued11-91 PrintedinU.S.A
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1001-4
TORQUE SPECIFICATIONS - STEEL HYDRAULIC FITTINGS
TubeOD
HoseID Thread Size Pound- Inches
37DegreeFlareFitting
Newton
metres
SplitFlangeMountingBolts
Rae8-71601
TubeOD
HoseID
1/2inch
12.7mm
TubeOD
HoseID
Thread
Size Pound- Inches Newton metres
StraightThreadswithO-ring
3/4-16
Thread
Size
540to804 57to91
Pound- Newton
Inches metres
Issued11-91 PrintedinU.S.A
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Norn.
SAE
Dash
Size
Rae8-71601
TORQUE SPECIFICATIONS - STEEL HYDRAULIC FITTINGS
TubeOD Thread Size Pound- Inches Newton metres Thread Size Pound- Inches Newton metres
O-ringFaceSealEnd O-ringBossEnd FittingorLockNut
NOTE: Case Corporation reserves the right to make improvements in design
or changes in specifications at any time without incurring any obligation to
install them on units previously sold.
1001-5
Issued11-91 Printedin U.S.A

Section
1002
FLUIDS AND LUBRICANTS
CASE CORPORATION
700 State Street
Racine, WI 53404 U.S.A.
CASE CANADA CORPORATION
450 Sherman Avenue
Hamilton, ON L8N 4C4 CANADA Bur 7-12131
© 2000 Case Corporation
Printed in U.S.A.
April, 2000

1002-2
TABLE OF CONTENTS
CAPACITIES AND LUBRICANTS ............................................................................................................................ 2
ENGINE OIL RECOMMENDATIONS ....................................................................................................................... 3
DIESEL FUEL........................................................................................................................................................... 4
MAINTENANCE SCHEDULE - 621C/721C ............................................................................................................. 5
CAPACITIES AND LUBRICANTS
Engine oil
Capacity with filter change - 621C ......................................................................... 15.1litres (16 U.S. quarts)
721C ........................................................................ 20.8 litres (22 U.S. quarts)
Type of oil. ................................................ Case No. 1 engine oil - see engine oil recommendations on page 3
Engine cooling system
Capacity- 621C .................................................................................................... 26.5 litres (28 U.S. quarts)
721C .................................................................................................... 32.1 litres (34 U.S. quarts)
Type of coolant ............. Ethylene glycol and water mixed for lowest ambient temperature (at least 50/50 mix)
Fuel tank
Capacity - 621C ................................................................................................... 193 litres (51 U.S. gallons)
721C ................................................................................................. 204 litres (53.9 U.S. gallons)
Type of fuel ...................................................................................... See Diesel fuel specifications on page 4
Hydraulic system
Hydraulic reservoir refill capacity - 621C and 721C ............................................ 90.1 litres (95.2 U.S. quarts)
Total system capacity - 621C and 721C .................................................................. 153.1 litres (40.5 gallons)
Type of oil .................................................................................................................. MS-1209 Hy-Tran Ultra®
Transmission
Refill capacity with filter change - 621C..................................................................... 7.4 litres (8 U.S. quarts)
721C ............................................................ 12.3 litres (3.25 U.S. gallons)
Total system capacity - 621C .............................................................................. 18.9 litres (20.0 U.S. quarts)
721C ............................................................................. 22.7 litres (24.0 U.S. quarts)
Type of oil ...................................................................................................................Case No. 1Engine Oil (15W-40)
Axles
Capacity of center bowl
621C Front and rear (each) ............................... 8.5 litres (9 quarts) 135H EP Plus 0.9 litres (2 pints) B91246
721C Front ................................................. 13.7 litres (14.5 quarts) 135H EP Plus 1.4 litres (3 pints) B91246
721C Rear ....................................................................... 8.5 litres (9 quarts) 135H EP Plus 0.9 litres (2 pints) B91246
Capacity of planetary (each) - 621C and 721C ............................................... 5.5 litres (6 quarts) 135H EP
Type of lubricant ........................................................................... Case (MS1316) 135H EP (SAE 85W-140)
Limited slip additive .................................................................................................................. Case B91246
Brake system
Type of fluid (same as hydraulic system) ................................................................. MS-1209 Hy-Tran Ultra®
NOTE: DO NOT use an alternate oil in the axles. The brake components in the axles could be damaged
as a result of using an alternate oil.
Imperial quart= litres x 0.879877
Imperial gallons= litres x 0.219969
Bur 7-12131
Conversion Formulas
Issued 4-00 Printed in U.S.A.

1002-3
ENGINE OIL RECOMMENDATIONS
Engine Oil Selection
Case No. 1 Engine oil is recommended for use in your Case engine. Case engine oil will lubricate your engine
correctly under all operating conditions.
If Case No. 1 Multi-Viscosity or Single Grade Engine
Oil is not available, use only oil meeting API engine
oil service category CE.
292L91
See the chart below for recommended viscosity at ambient air temperature ranges.
NOTE: Do not put performance additives or other oil additive products in the engine crankcase. The oil
change intervals given in this manual are according to tests with Case lubricants.
Bur 7-12131
-40°
Oil Viscosity/ Temperature Ranges
Temperature Fahrenheit
-20° 20° 40° 60° 80° 100°
-30° 30° 50° 70° 90°
Temperature Celsius
120°
110°
-NOTE: Use of an engine oil pan heater or an engine coolant
heater is required when operating temperatures are in the
shaded area.
Issued 4-00 Printed in U.S.A.

1002-4
DIESEL FUEL SYSTEM
Use No. 2 diesel fuel in the engine of this machine. The use of other fuels can cause the loss of engine
power and high fuel consumption.
In very cold temperatures, a mixture of No. 1 and No. 2 diesel fuels is temporarily permitted. See the
following Note.
NOTE: See your fuel dealer for winter fuel requirements in your area. If the temperature of the fuel
lowers below the cloud point (wax appearance point), wax crystals in the fuel will restrict the fuel filter
and cause the engine to lose power or not start.
The diesel fuel used in this machine must meet the specifications as shown below in, "Specifications for
Acceptable No. 2 Diesel Fuel", or "Specification D975-81" of the American Society for Testing and Materials.
Fuel Storage
If you keep fuel in storage for a period of time, you can get foreign material or water in the fuel storage tank.
Many engine problems are caused by water in the fuel.
Keep the fuel storage tank outside and keep the fuel as cool as possible. Remove water from the storage
container at regular periods of time.
Fill the fuel tank at the end of the daily operating period to prevent condensation in the fuel tank.
Specifications for Acceptable No. 2 Diesel Fuel
API gravity, minimum .................................................................................................................................. 34
Flash point, minimum .................................................................................................................. 140°F (60°C)
Cloud point (wax appearance point), maximum .................................................. -5°F (-20°C) See Note above
Pour point, maximum ........................................................................................ -15°F (-26°C) See Note above
Distillation temperature, 90% point ...................................................................... 540 to 640°F (282 to 338°C)
Viscosity, at 100°F (38°C)
Centistokes .................................................................................................................................. 2.0 to 4.3
Saybolt seconds universal ............................................................................................................. 32 to 40
Cetane number, minimum .................................................................. 43 (45 to 55 for winter or high altitudes)
Water and sediment, by volume, maximum .................................................................................... 0.05 of 1%
Sulphur, by weight, maximum ........................................................................................................... 0.5 of 1%
Copper strip corrosion, maximum ........................................................................................................... No. 2
Ash, by weight, maximum ............................................................................................................... 0.01 of 1%
Bur 7-12131 Issued 4-00 Printed in U.S.A.

MAINTENANCE SCHEDULE
Model 621 C / 721 C
Instructions
AS REQUIRED
1002-5
22 SERVICE THE AIR CLEANER IF THE AIR CLEANER WARNING LAMP ILLUMINATES ........................... SEE OPERATORS MANUAL
37 SERVICE AIR CLEANER PRECLEANER .................................................................................................. SEE OPERATORS MANUAL
30 REPLACE THE TRANSMISSION FILTER
IF THE TRANSMISSION FILTER RESTRICTION WARNING LAMP ILLUMINATES ................................................. USE CASE FILTER
19 CHECK THE RADIATOR COOLANT LEVEL IF THE WARNING LAMP ILLUMINATES ............................... SEE OPERATORS MANUAL
6 REPLACE THE HYDRAULIC FILTERS IF THE HYDRAULIC FILTER WARNING LAMP ILLUMINATES ................... USE CASE FILTERS
20 CHECK THE FAN BELT CONDITION ........................................................................................................... REPLACE AS REQUIRED
CHECK THE AIR CONDITIONING DRIVE TENSION (IF EQUIPPED) NOT SHOWN ...................................... ADJUST AS REQUIRED
-- EVERY10 HOURS OF OPERATIONOR EACH DAY-WHICHEVER OCCURS FIRST
16 CHECK THE ENGINE OIL LEVEL ............................................................................................................. SEE OPERATORS MANUAL
--------- EVERY50 HOURS OF OPERATION--------------
1 CHECK THE COOLANT RESERVOIR FLUID LEVEL ........................................................................ ETHYLENE GLYCOL AND WATER
29 CHECK THE TRANSMISSION OIL LEVEL (ENGINE RUNNING AND OIL WARM) .................................... SEE OPERATORS MANUAL
5 CHECK THE HYDRAULIC RESERVOIR FLUID LEVEL ............................................................................... SEE OPERATORS MANUAL
15 LUBRICATE THE REAR AXLE TRUNNION PIVOTS (2 FITTINGS) ................................................... CASE MOLYDISULFIDE GREASE
38 LUBRICATE THE BUCKET AND BELLCRANK PIVOT POINTS (10 FITTINGS) 621C/721 Cl XT ....... CASE MOLYDISULFIDE GREASE
27 LUBRICATE THE CENTER DRIVE SHAFT SLIP JOINT (1 FITTING) ............................................... CASE MOLYDISULFIDE GREASE
39 LUBRICATE THE BELLCRANK AND BUCKET PIVOTS (6 FITTINGS) 621C/721CZ-BAR ............... CASE MOLYDISULFIDE GREASE
----------EVERY 100 HOURS OF OPERATION--------------
7 LUBRICATE THE STEERING CYLINDER PIVOTS - ROD AND CLOSED END (4 FITTINGS) ............ CASE MOLYDISULFIDE GREASE
40 LUBRICATE THE LOADER LIFT ARM AND CYL. PIVOTS (7 FITTINGS) 621C/721CZ-BAR ........... CASE MOLYDISULFIDE GREASE
26 LUBRICATE THE FRONT DRIVE SHAFT SUPPPORT BEARING (1 FITTING) ................................. CASE MOLYDISULFIDE GREASE
32 LUBRICATE THE REAR DRIVE SHAFT SLIP JOINT (1 FITTING) .................................................... CASE MOLYDISULFIDE GREASE
8 LUBRICATE THE LOADER LIFT ARM AND CYLINDER PIVOTS (14 FITTINGS) 621C/721C/ XT ...... CASE MOLYDISULFIDE GREASE
-------------r-VERY 250 HOURS OF OPERATION -------------
19 CHECK THE RADIATOR COOLANT LEVEL .................................................................................... ETHYLENE GLYCOL AND WATER
2 CHANGE THE ENGINE OIL AND REPLACE THE ENGINE OIL FILTER ..................................................... SEE OPERATORS MANUAL
34 CHECK THE BATTERY FLUID LEVEL ...................................................................................................... SEE OPERATORS MANUAL
36 CHECK THE TIRE CONDITION AND AIR PRESSURE ............................................................................. SEE OPERATORS MANUAL
12 CLEAN THE CAB AIR FILTERS (IF EQUIPPED) ....................................................................................... SEE OPERATORS MANUAL
25 REPLACE ENGINE COOLING SYSTEM FILTER 721C.......................................................................................... USE CASE FILTER
--------- EVERY500 HOURS OF OPERATION-------------
3 REPLACE THE FUEL FILTERS .............................................................................................................................. USE CASE FILTERS
33 DRAIN WATER AND SEDIMENT FROM THE FUEL TANK ........................................................................ SEE OPERATORS MANUAL
14 REPLACE THE IN-LINE FUEL FILTER .................................................................................................................. USE CASE FILTERS
----------EVERY 1000 HOURS OF OPERATION--------------
21 CHECK THE ENGINE VALVE CLEARANCES ................................................................................................. SEE SERVICE MANUAL
6 REPLACE THE HYDRAULIC FILTERS .................................................................................................................... USE CASE FILTERS
30 REPLACE THE TRANSMISSION OIL FILTER ....................................................................................................... USE CASE FILTERS
28 CHANGE THE TRANSMISSION OIL ......................................................................................................... SEE OPERATORS MANUAL
23 CLEAN THE TRANSMISSION BREATHER ..................................................................................................... CLEAN WITH SOLVENT
24 LUBRICATE THE UPPER AND LOWER CHASSIS PIVOTS (2 FITTINGS) ....................................... CASE MOLYDISULFIDE GREASE
31 CHANGE THE FRONT/REAR AXLE DIFFERENTIAL AND PLANETARY OIL ............................................ SEE OPERATORS MANUAL
-EVERY2000 HOURSOF OPERATIONOR EACHYEAR - WHICHEVER OCCURS FIRST -----
4 CHANGE THE HYDRAULIC OIL AND CLEAN THE SCREEN ..................................................................... SEE OPERATORS MANUAL
18 DRAIN, FLUSH AND REFILL THE ENGINE COOLING SYSTEM .................................................... ETHYLENE GLYCOL AND WATER
22 REPLACE THE AIR CLEANER ELEMENTS .......................................................................................................... USE CASE FILTERS
NOTE: When you drain, flush and refill the engine cooling system, add one container (0.5L) of
Case cooling system treatment, and replace the cooling filter on 721C.
Bur 7-12131 Issued 4-00 Printed in U.S.A.

1002-6 MAINTENANCE SCHEDULE
Model 621 C / 721 C
39
39
GS98J002
If you operate the machine in severe conditions, lubricate and service the machine more frequently. It is
recommended that you see your Case dealer for information on the System Guard Lubrication Analysis
System.
See your Operators manual for maintenance of safety related items and for detailed information of the service
items on this chart. Operators and service manuals are available for this machine from your Case dealer.
Bur 7-12131
NOTE: The Case Company reserves the right to make improvements in
design or changes in specifications at any time without incurring any
obligation to install them on units previously sold.
Issued 4-00 Printed in U.S.A.

SECTION INDEX - ENGINE
Section Title
Section Number
EngineandRadiatorRemovalandInstallation-621C................................................................................................... 2000
EngineandRadiatorRemovalandInstallation- 721
C.................................................................................................. 2000
Stall Test.............................................................................................................................................................. 2002
ForEngineRepair,SeetheEngineServiceManual.
CASE CORPORATION
700 State Street
Racine, WI 53404 U.S.A.
CASE CANADA CORPORATION
3350SOUTHSERVICEROAD
BURLINGTON,ON L7N3M6 CANADA Bur 7-12140
© 1999 Case Corporation
Printed in U.S.A.
April, 1999