SECONDARY BRAKING AND
AUTOMATIC APPLY
A fundamental function of the brake system is to
provide reserve braking in the event of any single
failure. For this reason, the system is divided into
multiple circuits, each with its own isolation check
valve, accumulator, and circuit regulator. The secon-
dary system becomes whatever circuit(s) is operable
after a failure. If the failure is a jammed treadle valve,
then the brake lock becomes the secondary system,
otherwise, either of the two brake circuits would be the
secondary system.
The brake accumulators (1 & 3, Figure 2-1), (as de-
scribed under service brake circuit) perform two func-
tions; rapid flow for good response and store energy
for secondary braking. The circuit check valve assures
this energy is retained should a failure occur in brake
system supply or an accumulator circuit.
If a failure occurs in the pump, steering or either brake
accumulator circuit, a low brake pressure warning light
(on the instrument panel) and an audible alarm (in the
cab) will actuate and the vehicle should be stopped as
soon as practical. When the pressure in one accumu-
lator circuit is less than the preset level, all the service
brakes will be automatically applied. Automatic brake
application is accomplished by the "Automatic Apply
Valve" (PS1, 19), located in the brake manifold. This
valve senses the lower brake accumulator pressure,
and when the pressure is less than 2000
±
75 psi
(13800
±
520 kPa), the valve shifts, operating the brake
treadle valve and applying all the brakes full on.
Regardless of the nature of location of a failure, sens-
ing the lowest brake accumulator circuit pressure as-
sures two to four full brake applications after the low
brake warning light and buzzer, and before automatic
apply. This allows the operator the opportunity to
safely stop the truck after the warning has turned on.
PARKING BRAKE CIRCUIT
The parking brake is spring applied and hydraulically
released.
NOTE: Whenever the park brake solenoid is de-ener-
gized, a spring in the solenoid valve will shift the spool
to the position to allow the park brake to be applied.
Normal Operation
(key switch on, engine running)
•
Parking brake switch "ON"
The parking brake solenoid (16) is de-energized.
The oil pressure in the parking brake lines return
to tank and the springs in the parking brake will
apply the brake. The parking brake pressure
switch (23) will close, completing a path to
ground, and illuminating the parking brake light
on the instrument panel.
•
Parking brake switch "OFF"
The parking brake solenoid is energized. The
pressure oil is routed from the park brake sole-
noid, to the parking brake pressue regulator (4)
(reducer), then to the park brake calipers for
release. The parking brake circuit is protected
against accidental apply by monitoring a wheel
motor speed sensor. The park brake with not
apply until the truck is virtually stopped. This
eliminates park brake damage and will extend
brake adjustment intervals.
•
If the
key switch is turned "OFF"
(park brake
switch "ON" or "OFF"), the park brake will not
apply until vehicle speed is less than 1/3 MPH,
due to the monitoring of the wheel motor speed.
•
If loss of hydraulic supply pressure occurs,
with
Parking brake switch "OFF"
, the parking brake
solenoid will still be energized. The hydraulic
supply circuit is still open to the parking brake
calipers. A check valve in the park brake hydraulic
supply circuit traps the oil, holding the parking
brake in the release position.
NOTE: Normal internal leakage in the parking brake
solenoid and the pressure reducing valve may allow
leakage of the trapped oil to return back to tank, and
eventually allow park brake application.
•
If 24 volt power to the solenoid is interupted, the
park brake will apply at any vehicle speed. The
spring in the solenoid will cause it to shift, opening
a path for the oil pressure in the park brake line
to return to tank and the springs in the parking
brake will apply the brake. The parking brake
pressure switch (23) will close, completing a path
to ground, and illuminating the parking brake light
on the instrument panel.
J02032
Brake Circuit
J2-3
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 78: ... 0 3 4 5 67 5 789574 0 1 23 ...
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 653: ... A 0 A E 0 7 0 7 7 7 9 4 7 6 0 6 E E 7 0 ...
Page 654: ...0 1 0 9 2 4 7 7 7 E 7 0 4 9 4J0 4 4 E7 9 J 47 4 E 4 E7 E 7 0 7 09 49 6E E 2 2 ...
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 ...
Page 745: ... 0 0 1 2 0 0 3 3 0 0 1 2 0 4 5 6 7 6 4 ...
Page 746: ...8 9 9 8 9 9 9 9 2 8 3 1 1 3 3 9 9 9 0 3 4 6 7 6 4 5 ...
Page 748: ... 1 9 B 9 3 9 B 3 0 0 0 B 2 1 A 9 B 3 46 2 46 B 3 3 6 5 B 3 46 3 6 B 4 6 7 6 4 5 ...
Page 754: ...R1 2 System Schematics R01060 NOTES ...
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