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Hydraulic System Troubleshooting, Testing and
Adjustment
HYDRAULIC SCHEMATIC
The hydraulic schematic(s) is available in the "Hydraulic and Electrical Schematic Shop Manual." This
manual is a collection of diagrams and schematics for a number of models.
GENERAL NOTES
When referring to the schematic, refer to the following items:
•
As shown in the schematic, the main pump assembly is driven by the engine. Mechanical
energy is converted to hydraulic power, generating the required hydraulic flow which drives the
system. Two main pumps (a right side pump and a left side pump) make up the main pump
assembly.
•
Hydraulic output from the right side pump is transmitted to the right side of the control valve.
Output from the left side pump is transmitted to the valve spools on the left side of the control
valve. Hydraulic output from the pilot pump is used to control the pump and to operate pilot and
solenoid valves.
•
The right half of the hydraulic control valve, supplied by the right pump in the pump assembly,
operates valve spools for right travel, swing, boom up and arm functions. The amount of oil flow
to the actuators at the output end of each of those circuits is regulated through the movement of
each individual valve spool.
•
The left half of the hydraulic control valve, fed by the left pump in the pump assembly, has
control spools for left travel, bucket, boom and arm operation.
•
Two-stage operation is a feature of boom and arm function. All of these circuits can be operated
using the output of only one half of the hydraulic pump assembly (one pump or the other), or –
since both halves of the control valve have a spool and available circuit for these functions – the
output of both pumps can be combined, allowing higher speed operation. Boom up, arm crowd
and dumping functions can operate in any one of the two available power modes – the standard
or general duty mode, the high speed/rapid cycling mode.
•
Whenever the right travel or left travel control spools are shifted, output from the main pump
assembly flows through the center joint to one or both of the axial piston motors driving the side
frame crawler tracks. A pilot valve connected to the swash plate of each travel motor changes
motor capacity (and output) in direct proportion to the position of the travel switch selected by
the operator.
•
The hydraulic reservoir return line and the pilot circuit both have 10 micron full flow filters. The
disposable elements in these two canister-type filters trap and remove impurities from the oil in
the system. An 80 mesh, 177 micron reservoir intake strainer also helps maintain system
cleanliness and should be cleaned each time hydraulic fluid is drained and replaced. An oil
cooler in the hydraulic system helps maintain the operating temperature of the system at
approximately 50°C (122°F).
•
The arm cylinder operating circuit includes anti-vacuum valves which protect the hydraulic
system from vacuum that could result from external shocks or other unusual conditions. Boom,
Arm, and Bucket cylinder circuit are also protected by overload relief valves. Whenever high
pressure is generated as a result of a shock or overload, excess pressure is dumped to the
reservoir return circuit through the relief valve.
A selection valve in the travel circuit can be used to provide constant high torque/low speed travel, or
variable speed/variable torque output for travel. To prevent sliding during simultaneous travel and boom/
arm/bucket operation, select the high torque/low speed travel position.
Содержание Solar 300LC-V
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Страница 110: ...S0403050K Page 2 Counterweight Return to Master Table of Contents TABLE OF CONTENTS General 3 Removal 5 Installation 7...
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Страница 120: ...S0405110K Page 4 Fuel Tank PARTS LIST 3 7 5 6 4 10 9 23 8 12 11 1 13 16 19 20 14 34 33 ARS1660L Figure 1...
Страница 140: ...S0407000 Page 6 Swing Bearing...
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Страница 165: ...1LOWER STRUCTURE AND CHASSIS...
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Страница 191: ...S0505000 Page 25 Track Assembly TRACK SPRING AND TRACK ADJUSTING CYLINDER PARTS LIST Figure 49...
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Страница 308: ...S0705000 Page 34 Cylinders 17 Force out pin bushing 1 from body of cylinder Figure 28...
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Страница 324: ...S0707270K Page 12 Swing Motor Toshiba MFC200 PARTS LIST Figure 6...
Страница 355: ...S0707315K Page 11 Travel Motor with Gearbox...
Страница 361: ...S0707315K Page 17 Travel Motor with Gearbox JIG 7 JIG 8 JIG 9 JIG 10 JIG 11 JIG 12 ARS4000L Figure 14...
Страница 362: ...S0707315K Page 18 Travel Motor with Gearbox JIG 13 JIG 14 JIG 15 JIG 17 JIG 18 ARS4010L JIG 19 20 JIG 16 Figure 15...
Страница 424: ...S0708315K Page 28 Main Pump Kawasaki CONSTRUCTION OF REGULATOR Figure 22...
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Страница 450: ...S0709401K Page 6 Main Control Valve Kayaba Figure 1...
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Страница 634: ...S0892160K Page 4 Electrical Schematic S300LC V SOLAR 300LC V Figure 2...
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