FINAL DRIVE GP 1913244 - Caterpillar

Makeup Check Valve
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Multifunction Valve (1) Cap (2) Stud (3) Locknut (4) Spring (5) Collar (6) Spring (7) Spindle (8) Passage (9) Poppet (10) Seat (11) SeatThe multifunction valve has a second function. The valve acts as a makeup valve for the closed circuit. When the pressure in passages (8) (low pressure side of the closed circuit) drops below the charge pressure, charge oil fills the closed circuit. Charge oil pressure on poppet (9) compresses spring (4). Poppet (9) is lifted off seat (10). Oil from the charge loop flows into the low pressure side of the open circuit. When the pressure in the low pressure side of the open circuit increases to charge pressure, the force of spring (6) closes poppet (9) on seat (10). Bypass Valve
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Multifunction Valve (1) Cap (2) Stud (3) Locknut (4) Spring (5) Collar (6) Spring (7) Spindle (8) Passage (9) Poppet (10) Seat (11) SeatThe multifunction valve has a third function. The valve allows the machine to be towed. To tow the machine, loosen locknut (3) and turn stud (2) clockwise until the stud makes contact with the top of collar (5). Spring (4) is compressed. Then, turn stud (2) until the top of the stud is flush with locknut (3). Spindle (7) moves downward and the oil flows across seat (11). This action allows the oil to pass from one side of the closed circuit to the other side. Note: Brakes must be released prior to towing. Control Valve
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Directional Control Valve (1) Lever (2) Spool (3) Passage for charge oil (4) Control valve body (5) Servo valve leverThe propel control lever delivers a mechanical input to lever (1). The input determines the amount of rotation of spool (2). The output of the propel pump is proportional from 0 to 100 percent. This is based on the amount of charge oil that is allowed to flow from passage (3) through spool (2) and into the servo valve. Charge oil flows through passage (3) to the spool (2) and the oil is sent to either the right end of the servo valve or to the left end of the servo valve. The charge oil pressure shifts the servo valve, and a mechanical signal is sent to the swashplate. This upstrokes the propel pump.Neutral Start Control
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Location of Neutral Start Switch on Propel Pump (1) Neutral start switch.
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Neutral Start Switch (2) Spool (3) Electrical switch (4) Neutral start switch pinWhen the spool (2) is centered properly, neutral start switch pin (4) will rest between the spool and electrical switch (3). The electrical contact for the starter relay will not be broken. If spool (2) is shifted from neutral, pin (4) will be pushed outward. This will cause the contact inside electrical switch (3) to open. When electrical switch (3) is open, the electrical continuity of the start circuit will be broken and the machine will be prevented from starting. Brake Interlock Valve
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Propel Pumps (1) Brake interlock valves.Brake interlock