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IV-7
HYDRAULIC UNITS
HST PUMP
OPERATION
The pump covered here is a tandem pump for hy-
drostatic transmission. When combined together
with an HST travel motor, the speed of the motor
may be controlled from a speed of 0 to the specified
maximum, in smooth gradations and without the
switching of gears.
Hydraulic Pump
Cylinder block (1) has been constructed with nine
pistons (2) built in, and the end surface comes in
contact with the valve plate (5) containing intake
port (3) and exhaust port (4). Cylinder block (1)
rotates freely and is connected to drive shaft (6) via
the spline. Swash plate (7), on the other hand, is
connected to the housing and tilted somewhat, and
piston (2) is constructed to follow swash plate (7) in
its rotation.
Rotating drive shaft (6) at this point causes cylinder
block (1) to rotate, causes piston (2) connection to
cylinder block (1) to follow along with swash plate
(7) to move in a back-and-forth motion, and causes
the intake and exhaust pumps to begin working.
Thus the nine pistons (2) perform approximately a
single intake (A) or exhaust (B) sweep for each rota-
tion of cylinder (1), and operating drive shaft (6) in
continuous rotations allows you to perform a con-
tinuous stream of intake and exhaust operations.
Note that since the sweep capacity of piston (2) de-
pends on the degree of tilt of swash plate (7), the
tilt of the plate may be changed to modify the total
quantity of exhaust.
Displacement Control
Bearings are attached to both sides of swash plate
(1), the swash plate is connected to the housing so
that the degree of tilt may be changed, and piston (2)
is used to link the swach plate with control cylinder
(3).
In a neutral position, since the charge pressure of
swash plate (1) enters into chambers (4) and (5) to
preserve equal pressure, control cylinder (3) remains
at rest in a neutral position.
Summary of Contents for TL150
Page 1: ...TL150 Track Loader BOOK No CT7E901 WORKSHOP MANUAL Serial No 21500004...
Page 4: ...0 4...
Page 5: ...I 1 I GENERAL...
Page 18: ...I 14 GENERAL...
Page 19: ...II 1 II SPECIFICATIONS...
Page 44: ...III 1 III MACHINE CONFIGURATION...
Page 94: ...III 51 MACHINE CONFIGURATION ELECTRICAL SYSTEM ELECTRICAL SYSTEM ELECTRICAL WIRING DIAGRAM...
Page 122: ...III 79...
Page 146: ...MACHINE CONFIGURATION III 103...
Page 147: ...IV 1 IV HYDRAULIC UNITS...
Page 152: ...IV 6 HYDRAULIC UNITS HST PUMP 1 Plug 2 Plug 3 Plug 4 Screw 5 Seal Nut 6 Plug Pump Assembly 4 4...
Page 189: ...IV 43 HYDRAULIC UNITS GEAR PUMP INSPECTION AND ADJUSTMENT IV 36 38 TROUBLESHOOTING IV 39...
Page 230: ...IV 84 HYDRAULIC UNITS PILOT VALVE INSPECTION AND ADJUSTMENT IV 79 TROUBLESHOOTING IV 80...
Page 261: ...IV 115 HYDRAULIC UNITS TRAVEL MOTOR DISASSEMBLY AND ASSEMBLY Special tools...
Page 263: ...IV 117 HYDRAULIC UNITS TRAVEL MOTOR...
Page 282: ...IV 136 HYDRAULIC UNITS TRAVEL MOTOR...
Page 283: ...V 1 V TROUBLESHOOTING...