Case 621G, 721G Wheel Loader Service Manual Workshop Guide

Manual Included: • Service Manual: 3805 pages, 2615 pages and 3791 pages Specifications: • Brand: Case • Model: 621G, 721G • Type: Loader • Manuals: Service Manual • Publication Numbers: 48083740 (Jul 2018), 51428211 (Nov 2017) and 51428265 (Dec 2017) • Language: English • Format: PDF Description Table of Contents Content Introduction Engine Transmission Four Wheel Drive System Front Axle Rear Axle Hydraulic System Brakes and Controls Hydraulic System Frames and Ballasting Steering Wheels Cab climate control Electrical System Front Loader and Bucket Platform, Cab, Bodywork and Decals Special Tool Index Electrical Schematics Hydraulic Schematics Manual Extract: Arm – Repair Pressure check NOTE: this pressure is factory preset and is not adjustable. 1. Make sure that the temperature of the hydraulic oil is at least 54 – 57 °C (129.2 – 134.6 °F). The procedure to heat the hydraulic oil is the following. ● Check the oil temperature through the display in the cab (access to "Machine service – Sensor Status – Hydraulics" screens). ● Heat the hydraulic oil: A. Start the engine and run at full throttle. B. Hold the joystick in the ROLLBACK position while raising and lowering the lift arms from ground level to full height. • To heat the hydraulic oil do the following: A. Start the engine and run at full throttle. B. Hold the joystick in the ROLLBACK position while raising and lowering the lift arms from ground level to full height. C. Continue this procedure until the temperature of the hydraulic oil is 54 – 57 °C (129.2 – 134.6 °F) . 2. Raise lift arms to the top and turn off the engine. Turn the ignition key to the "RUN" position. 3. Repeatedly put the joystick into "FLOAT" position and back to neutral, as rapid as possible. 4. The system should allow a minimum of 10 actuations into float and still cause the lift arms to come down.