WRENCH A 5P0316 - Caterpillar

Introduction
This Special Instruction lists the key dimensions for rebuilding motor grader front axles and front axle components. Repair is encouraged to reduce replacement cost. Each item should be evaluated to determine the need for repair or replacement. Illustrations in this publication may look different from your machine. While the illustrations are typical, the dimensions are actual. Lean arms are serviced as an assembly.ALL DIMENSIONS LISTED ARE DIMENSIONS FOR MANUFACTURING AND ASSEMBLING A NEW MACHINE.Do not perform any procedure outlined in this publication, or order any parts, until you read and understand the information contained within.The 1U9600 Welding Group is available for welding oversized bores.The 1U8660 Hydraulic Boring Unit is available for machining bores.Reference: Service Manual, Parts Book and Metal Spray Guide SEBF2000, Special Instruction SEHS8985 and NEHS0513.Cleaning Procedure
All foreign material like oil, grease, water, paint, rust, dirt and scale must be removed before the welding operation. These materials discharge gas when they come in contact with heat. This gas can cause porosity (very small bubbles) in the weld deposit. Water or rust can cause a condition known as "hydrogen embrittlement" the result of which is cracks in the weld deposit.Remove oil and grease with solvent. Remove paint, rust, dirt and scale with a wire brush or glass beads.Cracks
No cracks are permissible, external or internal. If external cracks are suspected the part should be thoroughly cleaned and Magnafluxed.X-Ray or Ultrasonic methods are preferred checks for internal cracks. However, these methods are more involved and require special equipment to perform the checks.The cracks that are repairable should be cut or ground out approximately 6 mm (0.25") deeper than the original crack whenever possible. Fill the hole with weld.Bores
A dial bore gauge on a boring bar is recommended for measuring bores and perpendicular surfaces to the bores.Out-of-round bores should be checked for cracks and reworked if practical.Metal Spray
All lean arms and 16G spindle housings are heat treated. Do not weld on these parts. Metallic Spray can be used to build up the bores before machining. Refer to Metal Spray Guide SEBF2000 for procedures.Welding Controls
The voltage, current and polarity used has a specific effect on the weld deposit.Voltage
The voltage controls the shape and size of the weld bead. The weld bead becomes flatter as the voltage is increased.Current
The current (or amperage) controls the rate of weld deposit. The higher the amperage, the higher the rate of deposit. A high rate is desired because it decreases the amount of time needed for rebuilding. The use of high amperage to obtain high deposit rates is limited because of the heat factor. As the amperage rises, so does the heat input. The type of current can be either direct (DC) or alternating (AC). DC is generally used.Polarity
The polarity basically controls the penetration (depth) of the weld. If the electrode is positive (reverse polarity), there is more penetration. Normally, welding is done with direct current and electrode positive (DCEP). Right Hand Side Left Hand Side