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| Illustration 1 | g00887749 |
Schematic for the Propel Transmission and the Rotor Transmission (1) High pressure oil filter (2) Mixing chamber tilt cylinder (3) Shutdown lock valve (Mixing chamber tilt) (4) Control valve for the chamber tilt cylinder (5) Differential lock control valve (6) Manifold and Relief (priority valve) (7) Scavenge pump (8) Differential lock cylinder (propel) (9) Propel transmission (10) Rotor transmission (11) Transmission sump (12) Transmission gear pump (13) Transmission oil cooler (14) Transmission gear lube (15) Flywheel gear lube (16) Transmission gear lube (17) High clutch (propel) (18) Low clutch (propel) (19) Sump for propel transmission (20) Inlet port for propel transmission (21) Return line (propel transmission to scavenge pump) (22) Supply line to transmission cooler | |
Transmission gear pump (12) supplies propel transmission (9) and rotor transmission (10). Transmission gear pump (12) draws oil from sump (11) for the rotor transmission. The oil is filtered through high pressure oil filter (1). Oil filter (1) has a 345 kPa (50 psi) bypass valve. Oil flows from high pressure oil filter (1) to priority valve (6) .
Oil is directed from manifold and relief valve (6) to the following components:
- Propel transmission (9)
- Rotor transmission (10)
- Rotor tilt cylinder (2)
- Differential lock valve (5)
11.3 L/min (3.0 US gpm) of oil flows to propel transmission (9). The oil is used in order to drive the motor side of the scavenger pump before reaching the propel transmission.
Oil from the propel transmission sump is pumped to the rotor transmission sump by the scavenger pump. Since the pump side of the scavenger pump has a larger displacement than the motor side, all of the hydraulic oil in the propel transmission case is pumped to the rotor transmission sump.
Control valve (4) for rotor tilt cylinder (2) controls oil flow to rotor tilt cylinder (2). Shutdown lock valve (3) keeps the rotor hood tilted when the machine is not operated. Differential lock valve (5) controls the oil flow to the differential lock in the axle.
Oil supply to rotor transmission (10) is received at the control valve on the transmission. Oil is divided between the control for rotor transmission (10) and the transmission oil cooler. Oil flows from transmission oil cooler (13) to flywheel gear lube (15) and to transmission gear lube (16) .
Clutch Operation
Low Gear
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| Illustration 2 | g00887080 |
Transmission (De-energized Solenoid) (1) High Clutch (2) Low Clutch (3) Rotary Manifold (4) Control Valve Spool (5) Plunger Assembly (6) Solenoid (7) Piston (8) Regulator Spring (9) Regulator (10) Control Valve (11) Spring | |
Transmission control valve (10) is a two speed control. When solenoid (6) is not energized, low gear clutch (2) is automatically engaged.
Pressure oil from the transmission pump and from the priority valve flows to regulator (9). Pressure oil also flows to the top of piston (7). Pressurized oil is blocked to valve spool (4) by plunger assembly (5). The force of spring (11) holds control valve spool (4). The force directs the pressure oil to rotary manifold (3). Rotary manifold (3) directs oil to low clutch (2). High clutch (1) is vented to the tank.
Piston (7) regulates the clutch pressure as clutch (1) is applied or while clutch (2) is applied. The force of piston (7) against regulator spring (8) acts as an accumulator when the clutch is activated. Once piston (7) has moved to the bottom of the bore, clutch pressure will raise to the regulator setting. Oil pressure will move regulator (9) upward. Excess oil flow will dump into the lube circuit.
The pressure setting for regulator (9) is 1378 kPa (200 psi).
Power Flow (Low Gear)
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| Illustration 3 | g00887092 |
Power Flow (1) High Speed Clutch (2) Low Speed Clutch (12) Low Clutch Gear (13) Input Shaft (14) Output Shaft | |
The output shaft of the propel motor splines into input shaft (13) of the transmission. High clutch (1) and low clutch (2) are mounted on transmission input shaft (13). Neither clutch is activated if the engine is not running. There is no hydraulic supply in order to activate the clutches. As soon as the engine starts, the appropriate clutch is activated. The clutch places the transmission in gear.
Note: The transmission defaults to low clutch (2) when high speed clutch (1) is not selected.
Pressurized oil from transmission pump (11) flows to transmission control valve (10). When solenoid (6) is not energized, oil flows through rotary manifold (3) in order to apply low speed clutch (2) .
When low speed clutch (2) is applied, low clutch gear and input shaft (13) turn at the same speed. Low speed (high gear ratio) occurs. The transmission has a countershaft design. This design accomplishes gear reduction in steps.
Power flow is seen by the power flow arrows. Power flow exits the transmission through output shaft (14) .
High Gear
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| Illustration 4 | g00887096 |
Transmission (Energized Solenoid) (1) High Speed Clutch (2) Low Speed Clutch (3) Rotary Manifold (4) Control Valve Spool (5) Plunger Assembly (6) Solenoid (7) Piston (8) Regulator Spring (9) Regulator (10) Control Valve (11) Spring | |
When solenoid (6) is energized, plunger assembly (5) is retracted. Pressure oil flows to the top of control valve spool (4). The oil overcomes the force of spring (11). The oil flows to rotary manifold (3). Rotary manifold (3) directs the oil to high speed clutch (1) .
Power Flow (High Gear)
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| Illustration 5 | g00887078 |
Power Flow (1) High Speed Clutch (2) Low Speed Clutch (12) Input Shaft (13) Output Shaft (15) High Speed Gear | |
The output shaft of the propel motor splines into input shaft (13) of the transmission. High speed clutch (1) and low speed clutch (2) are mounted on transmission input shaft (13). As soon as the engine starts, the appropriate clutch is activated. The clutch places the transmission in gear.
Note: The transmission defaults to low clutch (2) when high speed clutch (1) is not selected.
Pressurized oil from transmission pump (11) flows to transmission control valve (10). When solenoid (6) is energized, oil flows through rotary manifold (3) in order to apply high speed clutch (1) .
When high speed clutch (1) is applied, high speed clutch gear and input shaft (13) turn at the same speed. High speed (low gear ratio) occurs. The transmission has a countershaft design. This design accomplishes gear reduction in steps.
Power flow is seen by the power flow arrows. Power flow exits the transmission through output shaft (14) .