Complete digital official shop manual contains service, maintenance, and troubleshooting information for the Case 721E Wheel Loader. Diagnostic and repair procedures are covered in great detail to repair, maintain, rebuild, refurbish or restore your Case 721E like a professional mechanic in local service/repair workshop. This cost-effective quality manual is 100% complete and intact as should be without any missing pages. It is the same factory shop manual used by dealers that guaranteed to be fully functional to save your precious time.
This manual for Case 721E is divided into different sections. Each section covers a specific component or system and, in addition to the standard service procedures, includes disassembling, inspecting, and assembling instructions. A table of contents is placed at the beginning of each section. Pages are easily found by category, and each page is expandable for great detail. It is in the cross-platform PDF document format so that it works like a charm on all kinds of devices. You do not need to be skilled with a computer to use the manual.
“84243980.pdf”
721E TIER 3 Wheel loader Service Manual
970 pages
84243980
(Replaces 87634099)
Revised December 2009
Issued September 2007
“5-3070.pdf”
721E Wheel Loader Electrical Schematic
Part Number: 5-3070
BC06J371-00A
“87479861 NA.pdf”
721E, 821E Tier 3 Operator’s Manual
268 pages
87479861 NA
Issued 03-2008
Replaces 87364251 NA
EXCERPT:
721E Wheel Loader
Service Manual 84243980
(Replaces 87364099)
Table of Contents
General Tab 1
Section Index – General 5-2670
Standard Torque Specifications 1001 8-71603
Fluids and Lubricants 1002 5-2680
Metric Conversion Chart 1003 7-52950
Engines Tab 2
Section Index – Engines 5-2690
Engine and Radiator Removal and Installation 2000 5-2700
Stall Tests 2002 5-2710
After Cooler 2003 6-49850
For Engine Repair, See the Engine Service Manual 87519803
Fuel System Tab 3
Section Index – Fuel System 5-2720
For Fuel System Repair, See the Engine Service Manual
Electrical Tab 4
Section Index – Electrical 5-2730
Removal and Installation of Starter and Alternator 4001 5-2740
Electrical Specifications and Troubleshooting 4002 5-2750
Batteries 4003 6-42330
Instrument Cluster 4005 5-2760
Steering Tab 5
Section Index – Steering 84298386
(Replaces 5-2770)
Removal and Installation of Steering Components 5001 5-2780
Steering Specifications, Pressure Checks, and Troubleshooting 5002 5-2790
Steering Cylinders 5005 5-2800
Center Pivot 5006 5-2810
Auxiliary Steering Motor and Pump 5008 6-42430
Joystick Steering 5009 5-17020
Section Index – Power Train 84251801
(Replaces 5-2820)
Removal and Installation of Power Train Components 6001 5-2830
Transmission Specifications, Pressure Checks, and Troubleshooting 6002 5-2840
Transmission 6003 5-2850
Front Axle 6004 5-2860
Rear Axle 6004 5-2870
Rear Axle, Serial Number N8F203816 and After 6004 84243983
Drive Shafts, Center Bearing, and Universal Joints 6005 5-2880
Wheels and Tires 6006 6-47730
Transmission Control Valve 6007 6-81450
Brakes Tab 7
Section Index – Brakes 5-2890
Removal and Installation of Brake Components 7001 5-2900
Hydraulic Brake Troubleshooting 7002 5-2910
Brake Pump 7003 5-2920
Brake Accumulators 7004 6-47761
Parking Brake 7008 5-2930
Hydraulics Tab 8
Section Index – Hydraulics 5-2940
Removal and Installation of Hydraulic Components 8001 5-2950
Hydraulic Specifications, Troubleshooting, and Pressure Checks 8002 5-2960
Cleaning the Hydraulic System 8003 7-49641
Hydraulic Pump 8004 5-2970
Loader Control Valve 8005 5-2980
Cylinders 8006 5-2990
Coupler Solenoid Locking Valve 8007 6-42600
Ride Control Accumulator 8013 5-3000
Ride Control Valve 8014 5-3010
Mounted Equipment Tab 9
Section Index – Mounted Equipment 5-3020
Air Conditioning Troubleshooting and System Checks For Systems with HFC-134a
Refrigerant 9002 5-4030
Air Conditioner System Service 9003 5-3030
Removal And Installation Of Air Conditioning And Heater Components 9004 5-3040
Loader 9006 5-3050
Roll Over Protective Structure (ROPS), Cab Structural Frame (CSF) 9007 5-3060
Cab Glass Installation 9010 6-42710
Electrical Schematic Foldouts and Hydraulic Schematic Foldout In Rear Pocket 5-3070
TROUBLESHOOTING THE STEERING SYSTEM
NOTE: The steering hydraulic schematic is included in the hydraulic schematic. Refer to the rear pocket of this manual.
1. Make sure the oil level in the hydraulic reservoir is correct. Visually inspect the steering system for leakage and damage.
2. The loader/steering pump differential pressure must be properly adjusted. Refer to Section 8002
Testing and Adjusting the Loader/Steering Pump differential Pressure.
3. Do the steering limit valve pressure test. Refer to page 6. If the pressure is above or below specifications, adjust the steering limit valve.
4. Do the main hydraulic pump test. See Section 8002. If the main pump is bad, repair or replace the main hydraulic pump.
5. Test the steering cylinders for leakage, refer to instructions on page 8. If a steering cylinder is leaking, repair or replace the steering cylinder.
6. If the steering system is noisy test the back pressure relief valve, refer to instructions on page 9.
AUXILIARY STEERING SYSTEM PUMP TEST
Equipment Required
1. CAS- 10280 Flowmeter
2. CAS-1808 Flowmeter fitting kit
Test Procedure
1. Install articulation lock.
BD03A040
NOTE: When performing this pressure check,
always be sure the articulation lock is in place,
especially when working in the articulation joint
areas.
2. Loosen and remove the outlet hose to the
Auxiliary Steering Pump from the Auxiliary
Steering Priority Valve.
3. Install a plug into the Auxiliary Steering Priority Valve.
4. Connect the inlet of the flowmeter to the outlet line of the Auxiliary Steering Pump.
5. Install the outlet hose of the flowmeter in the hydraulic reservoir and hold in place with wire.
6. Connect the ammeter clamp (1) to the cable as in illustration.
7. Make sure that the parking brake is applied and the bucket is on the floor.
8. Make sure that the oil is at operating temperature.
9. Make sure that the load valve for the flowmeter is open (zero pressure).
10. Start and run the engine.
11. Stop the engine and turn the key back to the On position.
12. Turn the steering wheel, this will activate the auxiliary steering pump.
13. Turn the load valve on the flowmeter towards CLOSED until the pressure is 104 bar (1500 psi).
14. Read the flowmeter and ammeter gauges and record the readings.
15. The flowmeter reading must not be less than
24.6 L/min, (6.5 U.S. gpm). The ammeter reading must be 315 amps.
16. Turn the key switch to the OFF position. If the flow was less than the specification, or if the amperage was more than 315 amperes, remove the auxiliary steering motor and pump. Test the auxiliary steering motor. If the motor is good, make repairs to the pump.
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