Текст документа
2 2-1 SECTION 2 HYDROSTATIC DRIVE SYSTEM Specifications 2.1 Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pg. 2-3 General Information 2.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pg. 2-4 Trouble Shooting 2.3 Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pg. 2-5 ~ 7 Diagnose Steps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pg. 2-8 Pressure Tests 2.4 Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pg. 2-9 Towing Procedure 2.5 Procedure . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . pg. 2-10 Flushing The Hydraulic System 2.6 General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pg. 2-11 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pg. 2-12 ~ 13 Start-up Procedure 2.7 Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pg. 2-14 Gear Pump Replacement 2.8 Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pg. 2-15 Tandem Pump Replacement 2.9 Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pg.
2-16 ~19 Tandem Pump Parts Diagram 2.10 Parts Illustrations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pg. 2-20 ~ 23 Drive Motor 2.11 General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .pg. 2-24 ~ 27 Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pg. 2-28 ~ 29 Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pg. 2-30 ~ 31 Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pg. 2-32 ~ 39 Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pg. 2-40 ~ 44 Torque Specifications 2.12 Torque Chart . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . pg. 2-45 Conversion Chart 2.13 Conversion Factors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pg. 2-46 ~ 47
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2 2-2 HYDROSTATIC CIRCUIT 2.1 Hydrostatic Circuit and System Pressure Schematic A High Pressure Relieved at 345 Bar (5000PSI) Aux. Press. Relief Set at 2400 PSI (207 Bar) System Charge Pressure 200 PSI Minimum (13.8 Bar) Return Pressure Suction Line (Vacuum) 4 - 6 Hg @ 160ºF (71ºC) B C D E C D D D D B D A C E D C A C B C C C4165
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SPECIFICATIONS 2.1 Hydrostatic Tandem Pump Pump Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Variable Displacement, Reversible Piston Brand Name of Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Sauer-Danfoss Series Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 / M44 No. Of Drive Pumps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 (TWO) Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tandem Rotation (viewed from shaft end) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Clockwise Operating Speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2800 RPM (+ / - 50 RPM) Pump Displacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.65 cu. in. (44cc) Minimum Pump Output (flow) . . . . . . . . . . . . . . . . . 17.1 gal. (64.7L) / Minute @ 1800RPM . . . . . . . . . . . . . . . . . . . . . . . . . . . . @ 2000 PSI (136.1 Bar) Over Measured Charge Pressure No. Of Relief Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 (TWO) Relief Valve Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 345 Bar (5000 PSI) Max. Allowable Case Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 PSI (1.7 Bar) Charge Pump Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.6cc/rev. Geroter Style Charge Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200 PSI Min. (13.8 Bar) Hydrostatic Repair Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Thomas P / N 44232 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Sauer Sundstrand P / N BLN-9992 2 Hydraulic Drive Motor Drive Motor Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Geroter Torque Motor With Brake Brand Name . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Sauer-Danfoss Series Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TMT 500 FLV Rotation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Dual No. Of Drive Motors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 (TWO) Drive Motor Displacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31.9 cu. in. (523cc) Max. Case Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 250 PSI (17.3 Bar) Reservoir Fluid Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10w30 API Class SJ Oil Reservoir Filtration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . One 100 Micron Screen Element Hydraulic Oil Filtration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . One 5 Micron Element Hydraulic Element . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . P / N 35243 2-3
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2 2-4 GENERAL INFORMATION 2.2 Introduction: Counterclockwise Variable displacement Fixed displacement swash plate rotation piston pump drive motor Case drain Clockwise input shaft rotation High pressure Charge pressure inlet High pressure High pressure C3760 The driveshaft of the piston pump is rotated by the engine. The piston block which is splined to the driveshaft also turns. The piston block, rotating group, consists of 9 piston assemblies which have free swiveling shoes swagged on the ball end of each piston assembly. The shoe end of the piston rides against the smooth machined surface of the swashplate.
With the swash- plate in the neutral position, the piston assemblies do not recip- rocate in the piston block, but are rotating. No oil is drawn into or discharged from the pump. The pump is in a zero displace- ment position and the loader remains stationary. With the swashplate in the neutral position, the pressure of the charge oil, which ranges from 200 psi (13.8 Bar), is able to unseat both check valves and supply oil to both sides of the pump because of the balance in pressure. Very little charge oil volume is required in the neutral position so the excess oil is bypassed over the charge pressure relief valve and recirculated back to the reservoir.
The oil that leaks internally in the pump and motor collects in their body housings and is returned to the reservoir by external case drain in the pump and motors. This leakage oil is the only oil the charge check replenishes. This makes the design a closed loop system. When the swashplate begins to move the check valve on the dis- charge, or pressure, side seats because of the higher pressure differential. The other check valve remains open on the intake or low pressure side to continue supplying the closed loop sys- tem with charge oil. The drive motor, which is a fixed displacement type, delivers a constant output torque for a given pressure throughout the speed range of the motor.
The movement of the pump swashplate, forward or reverse, controls the direction of the drive motor rotation. The function of the pressure relief valve is to relieve the pres- sure side of the system of excessive high pressure when the loader encounters a heavy load or stalls out. When the relief valve senses an over load it unseats, allowing excess pressure and volume to flow into the low pressure side of the pump. A small volume of oil starts to flow across to the other relief valve. This relief valve is exposed to the low pres- sure on the intake side of the pump and is seated by the spring tension within the relief valve body.
The small volume of oil being bypassed is enough to unseat the relief valve and let it recirculate back into the inlet side of the pump. As the pressure continues to build on the pressure side, a larger volume of oil flows and at a greater speed through the drilled orifice in the relief valve cartridge, causing a pressure drop inside the relief valve. The surrounding pressure is now able to unseat the relief valve and bypass maximum volume of oil. The system reliefs function the same for both sides of the system. As the steering lever is moved forward, or reverse, the loader starts a directional movement.
As the swashplate begins to move, the piston assemblies start to reciprocate in the piston block. As the steering lever continues further movement the cam angle increases, the pistons reciprocate further, more oil is pumped and the speed of the loader is increased.
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