Part number 51428265
2nd edition English
December 2017

This Factory Service Repair Manual offers all the service and repair information about Case 621G , 721G Tier 4B (final) Wheel Loader. With this in-depth & highly detailed manual you will be able to work on your vehicle with the absolute best resources available, which will not only save you money in repair bills but will also help you to look after your investment. The information on this manual covered everything you need to know when you want to repair or service on Case 621G , 721G Tier 4B (final) Wheel Loader.

Models Covered:

Product Market Product Engine
621G WHEEL LOADER ZBAR-EH, NEW CAB TIER4B NA North America F4HFE613W*B002
621G WHEEL LOADER XT-EH, NEW CAB TIER4B NA North America F4HFE613W*B002
621G WHEEL LOADER XR-EH, NEW CAB TIER4B NA North America F4HFE613W*B002
721G WHEEL LOADER ZBAR-EH, NEW CAB TIER4B NA North America F4HFE613T*B001
721G WHEEL LOADER XT-EH, NEW CAB TIER4B NA North America F4HFE613T*B001
721G WHEEL LOADER XR-EH, NEW CAB TIER4B NA North America F4HFE613T*B001

Manual Contents:

INTRODUCTION
Engine…………………………………………………………………………… 10
[10.001] Engine and crankcase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10.1
[10.202] Air cleaners and lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10.2
[10.500] Selective Catalytic Reduction (SCR) exhaust treatment . . . . . . . . . . . . . . . . . 10.3
[10.400] Engine cooling system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10.4
[10.414] Fan and drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10.5
[10.310] Aftercooler. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10.6
[10.304] Engine lubrication system . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10.7
Transmission…………………………………………………………………… 21
[21.113] Powershift transmission . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21.1
[21.135] Powershift transmission external controls. . . . . . . . . . . . . . . . . . . . . . . . . . 21.2
[21.105] Powershift transmission hydraulic components . . . . . . . . . . . . . . . . . . . . . . 21.3
[21.155] Powershift transmission internal components. . . . . . . . . . . . . . . . . . . . . . . . 21.4
[21.109] Transmission cooler and lines. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21.5
[21.700] Torque converter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21.6
[21.182] Differential. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21.7
Four-Wheel Drive (4WD) system ………………………………………….. 23
[23.314] Drive shaft. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23.1
Front axle system …………………………………………………………….. 25
[25.100] Powered front axle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25.1
[25.102] Front bevel gear set and differential . . . . . . . . . . . . . . . . . . . . . . . . . . . 25.2
[25.108] Final drive hub, steering knuckles, and shafts . . . . . . . . . . . . . . . . . . . 25.3
Rear axle system……………………………………………………………… 27
[27.100] Powered rear axle. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27.1
[27.106] Rear bevel gear set and differential . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27.2

[27.120] Planetary and final drives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27.3
Brakes and controls ………………………………………………………….. 33
[33.202] Hydraulic service brakes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33.1
[33.110] Parking brake or parking lock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33.2
Hydraulic systems…………………………………………………………….. 35
[35.000] Hydraulic systems. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.1
[35.300] Reservoir, cooler, and filters. . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.2
[35.106] Variable displacement pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.3
[35.359] Main control valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.4
[35.357] Pilot system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.5
[35.204] Remote control valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.6
[35.752] Hydraulic fan drive cooling system. . . . . . . . . . . . . . . . . . . . . . . . . 35.7
[35.820] Hydraulic driven cooling fans . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.8
[35.355] Hydraulic hand control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.9
[35.701] Front loader arm hydraulic system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.10
[35.723] Front loader bucket hydraulic system . . . . . . . . . . . . . . . . . . . . . . . 35.11
[35.734] Tool quick coupler hydraulic system . . . . . . . . . .  . . . . . . . . . . . . . . . . 35.12
Frames and ballasting ……………………………………………………….. 39
[39.100] Frame . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39.1
Steering…………………………………………………………………………. 41
[41.101] Steering control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41.1
[41.200] Hydraulic control components. . . . . . . . . . . . . . . . . . . . . . . . . . . 41.2
[41.216] Cylinders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41.3
[41.910] Auxiliary steering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41.4
Wheels………………………………………………………………………….. 44
[44.511] Front wheels. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44.1
[44.520] Rear wheels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44.2
Cab climate control …………………………………………………………… 50

[50.200] Air conditioning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50.1
Electrical systems …………………………………………………………….. 55
[55.000] Electrical system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55.1
[55.100] Harnesses and connectors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55.2
[55.015] Engine control system. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55.3
[55.201] Engine starting system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55.4
[55.301] Alternator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55.5
[55.302] Battery. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55.6
[55.988] Selective Catalytic Reduction (SCR) electrical system . . . . . . . . . . . . . 55.7
[55.989] Exhaust Gas Recirculation (EGR) electrical system . . . . . . . . . . . . . . 55.8
[55.640] Electronic modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55.9
[55.024] Transmission control system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55.10
[55.020] Transmission speed sensors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55.11
[55.022] Transmission temperature sensors . . . . . . . . . . . . . . . . . . . . . . . . . 55.12
[55.028] Transmission fluid sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55.13
[55.512] Cab controls. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55.14
[55.415] Loader arm and bucket control system . . . . . . . . . . . . . . . . . . 55.15
[55.530] Camera. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55.16
[55.DTC] FAULT CODES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55.17
Front loader and bucket……………………………………………………… 82
[82.100] Arm. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82.1
[82.300] Bucket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82.2
Platform, cab, bodywork, and decals …………………………………………………… 90
[90.150] Cab. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90.1

This manual can be used by anyone from a first time owner/amateur to a professional technician.Even the most novice mechanic can also easily follow the step-by-step guides which are made simple by the illustrations and drawings. Keep this manual handy and use it often. Performing routine, preventive maintenance will save you time & money by helping to prevent premature failure and unnecessary repairs.

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