L4-2
Steering Circuit
L04037
Hydraulic oil flows to the closed center steering valve
via the flow amplifier. The flow amplifier is pilot-con-
trolled by the steering valve. Due to large oil dis-
placement in the steering cylinders, the flow amplifier
is incorporated in the steering circuit. The steering
column is connected directly to the steering valve.
When the steering wheel is rotated, oil is directed to
the steering cylinders via the flow amplifier to the
appropriate side of the pistons in the steering cylin-
ders. When steering circuit pressure reaches 2500
psi (17 238 kPa) at the flow amplifier, or during a no
steer situation, flow is blocked at the priority valve
within the flow amplifier.
COMPONENT DESCRIPTION
STEERING CONTROL UNIT
The steering control unit is located behind an access
cover on the front of the operator's cab. The steering
control unit is connected directly to the steering col-
umn. The valve incorporates a rotary meter which
ensures the oil volume supplied to the steering cylin-
ders is proportional to the rotation of the steering
wheel.
Operation of the steering control unit is both manual
and hydraulic in effect, providing the operator with
power steering. The valve will be spring returned
automatically to its closed, neutral position when
turning is stopped.
FLOW AMPLIFIER
The flow amplifier (Figure 4-2) is located on the left
inside frame rail just forward of the bleed down mani-
fold. The flow amplifier is required in the steering cir-
cuit due to the large volume of oil displacement
required for steering. The flow amplifier uses the
amount of flow from the steering control valve to
determine the amount of amplified flow to send from
the bleed down manifold to the steering cylinders.
Reference Figures 4-3 through 4-6 for oil flow paths
during the neutral, steering and external shock load
conditions.
Summary of Contents for 830E
Page 1: ...CEBM013200 Shop Manual DUMP TRUCK SERIAL NUMBERS A30708 A30732 ...
Page 2: ......
Page 4: ...NOTES ...
Page 8: ...A 4 Introduction A00032 KOMATSU MODEL 830E TRUCK ...
Page 9: ... ...
Page 10: ... ...
Page 12: ...A2 2 Major Component Description A02063 830E MAJOR COMPONENTS ...
Page 32: ...A3 18 General Safety and Operating Instructions A03020 NOTES ...
Page 34: ...A3 20 General Safety and Operating Instructions A03020 ...
Page 46: ...A3 32 General Safety and Operating Instructions A03020 NOTES ...
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Page 80: ...0 4 5 67 5 789574 0 1 23 ...
Page 82: ...NOTES B1 2 Index B01018 ...
Page 92: ...NOTES B3 6 Dump Body B03018 ...
Page 94: ...C1 2 Index C01024 NOTES ...
Page 116: ...NOTES C5 6 Air Filtration System C05012 4 98 ...
Page 135: ...D02023 24 VDC Electric Supply System D2 17 FIGURE 2 8 CRANKING MOTOR ASSEMBLY ...
Page 181: ...E02016 2 02 Electrical Propulsion Components E2 25 ...
Page 228: ...E2 72 Electrical Propulsion Components 2 02 E02016 NOTES ...
Page 290: ...G2 8 Tires and Rims 04 03 G02004 NOTES ...
Page 304: ...G3 14 Front Wheel Hub and Spindle 04 03 G03018 NOTES ...
Page 312: ...H1 2 Index 5 03 H01015 NOTES ...
Page 324: ...H3 4 Rear Suspensions 4 03 H03015 ...
Page 331: ... 0 0 6 76 6 7 5 5 M A 5 5 0 1 23 4 0 1 5 6 7 6 4 7 G 2 6 7 3 3 H I 5 5 3 HH ...
Page 333: ...C B 654 7 H 6 27 0 L C N 6 2J 7 5 0 M 6 27 1 J 5 654 27 0 5 0 5 0 5 0 67 0 6 7 A ...
Page 370: ...J4 10 Brake Circuit Check Out Procedure J04031 NOTES ...
Page 380: ...J5 8 Rockwell Wheel Speed Front Disc Brakes J05019 NOTES ...
Page 410: ...L2 4 Hydraulic System L02027 NOTES ...
Page 426: ...L3 16 Hydraulic Component Repair 7 02 L03026 NOTES ...
Page 429: ...L04037 Steering Circuit L4 3 FIGURE 4 2 FLOW AMPLIFIER ...
Page 431: ...L04037 Steering Circuit L4 5 FIGURE 4 3 FLOW AMPLIFIER No Steer ...
Page 433: ...L04037 Steering Circuit L4 7 FIGURE 4 4 FLOW AMPLIFIER Steering Left ...
Page 435: ...L04037 Steering Circuit L4 9 FIGURE 4 5 FLOW AMPLIFIER Steering Right ...
Page 437: ...L04037 Steering Circuit L4 11 FIGURE 4 6 FLOW AMPLIFIER No Steer External Shock Load ...
Page 441: ...L04037 Steering Circuit L4 15 FIGURE 4 9 CUT AWAY VIEW OF STEERING PUMP ...
Page 444: ...L4 18 Steering Circuit L04037 NOTES ...
Page 453: ...L05026 Steering Component Repair L5 9 FIGURE 5 7 FLOW AMPLIFIER VALVE ...
Page 476: ...L5 32 Steering Component Repair L05026 NOTES ...
Page 483: ...L07027 Hoist Circuit L7 7 FIGURE 7 6 FLOAT POSITION ...
Page 485: ...L07027 Hoist Circuit L7 9 FIGURE 7 7 POWER UP ...
Page 487: ...L07027 Hoist Circuit L7 11 FIGURE 7 8 HOLD POSITION ...
Page 489: ...L07027 Hoist Circuit L7 13 FIGURE 7 9 POWER DOWN ...
Page 491: ...L07027 Hoist Circuit L7 15 FIGURE 7 10 FLOAT POSITION ...
Page 492: ...L7 16 Hoist Circuit L07027 NOTES ...
Page 504: ...L8 12 Hoist Circuit Component Repair L08031 FIGURE 8 18 HOIST CYLINDER ...
Page 512: ...L8 20 Hoist Circuit Component Repair L08031 NOTES ...
Page 523: ...L10016 05 03 Hydraulic Check out Procedure L10 11 FIGURE 10 5 FLOW AMPLIFIER VALVE ...
Page 532: ...NOTES M1 2 Index M01047 ...
Page 546: ...NOTES M5 4 Wiggins Quick Fill Fuel System M05002 10 96 ...
Page 556: ...NOTES M8 6 Special Tools M08005 7 02 ...
Page 592: ...M9 36 Air Conditioning System 05 02 M09010 for HFC 134a Refrigerant NOTES ...
Page 596: ...M19 4 Radiator Shutters M19002 NOTES ...
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Page 678: ...N2 16 Truck Cab 04 03 N02014 NOTES ...
Page 682: ...N3 4 Cab Components N03018 NOTES ...
Page 688: ...N4 6 Operator Comfort N04023 NOTES ...
Page 710: ...N5 22 Operator Controls N05056 NOTES ...
Page 712: ...P1 2 Index P01028 NOTES ...
Page 715: ...P02039 Lubrication and Service P2 3 ...
Page 726: ...P2 14 Lubrication and Service P02039 NOTES ...
Page 744: ...P3 18 Automatic Lubrication System P03022 NOTES ...
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Page 754: ...R1 2 System Schematics R01060 NOTES ...
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