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CORE AS 2278369 - Caterpillar



2278369 CORE AS Caterpillar parts CORE
Rating:
21
Alternative (cross code) number:
CA2278369
227-8369
2278369
Caterpillar 2278369 CORE AS

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Recoil Group
Recoil Group(1) Valve assembly.(2) Valve assembly.(3) Tube assembly.(4) Cavity.(5) Piston assembly.The recoil group serves two purposes: (1) to maintain proper tension on the belt; and (2) to prevent too much tension on the belt. The recoil group is part of the front frame group. The front frame group is installed in the rear frame group. Piston assembly (5) is against a stop in the rear frame group.When assembled in a complete Mobil-trac System module, the recoil group acts like an accumulator. Cavity (4) is charged with nitrogen gas to a specified pressure (See Testing And Charging The Recoil Group). Under normal operating conditions, the nitrogen pressure acting against tube assembly (3) maintains the specified tension on the belt. If rocks or debris get between the drive wheels or idler wheels and the drive belt, tube assembly (3) moves to the rear, compressing the nitrogen gas in cavity (4). The rearward movement of tube assembly (3) prevents too much tension on the belt.Valve assembly (1) is used in checking the charge and recharging the recoil group. Valve assembly (2) is used when purging the oil from a new or rebuilt Mobil-trac System module.There is a pressure switch in the recoil group that can be connected to a light or other warning device. This is to alert the operator that the nitrogen charge in the recoil group is low. If the nitrogen charge is low, belt slippage may occur.Drive Motor
Mobil-trac System Drive Motor(1) Shaft assembly.(2) Spring.(3) Brake plates and discs.(4) Brake piston.(5) Cylinder block.(6) Piston.(7) Roller.(8) Cam ring.(9) Valve housing.(10) Valve.(11) Displacement selector spool.(12) Passage.(13) Passage.(14) Passage.Oil is supplied to the drive motors by a pump on the machine. All functions of the drive motors are controlled by valving on the machine.The hydraulic drive motor is a two speed (dual displacement) radial piston motor with a parking brake. In LOW range, (high torque, large displacement) the motor has a displacement of 4996 cc/rev (304.9 cu in/rev). In HIGH range, (low torque, small displacement) the motor has a displacement of 2498 cc/rev (152.4 cu in/rev). When the machine is shifted from LOW to HIGH, the drive motor displacement and torque are halved, and the turning speed is doubled. The drive motor can handle pressures up to 41340 kPa (6000 psi) and will operate in either direction.A high torque hydraulic drive motor is also available. The high torque motor functions the same as the standard motor, except the displacement is increased. In LOW range, (high torque, large displacement) the motor has a displacement of 6012 cc/rev (366.9 cu in/rev). In HIGH range, (low torque, small displacement) the motor has a displacement of 3006 cc/rev (183.4 cu in/rev).There are five lines connected to the motor: two high pressure loop lines, a displacement selector pilot line, a case drain line, and a brake line.The major components of the motor are shaft assembly (1); motor group consisting of cylinder block (5), pistons (6) with rollers (7), and cam ring (8); valve housing (9); valve


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