HYDRAULIC BRAKE ACCUMULATORS
Four hydraulic brake accumulators are installed on the
truck. Two identical accumulators are located on the
brake manifold in the brake control cabinet behind the
operator’s cab. The left accumulator supplies the pres-
sure necessary for actuation of the rear service brakes.
The right accumulator supplies pressure to activate the
front service brakes.
Two larger volume accumulators, located on the RH
frame rail behind the tire, supplement the above accu-
mulators, one for the front and one for the rear brake
circuits.
Accumulators maintain high pressure. DO NOT
disconnect any hydraulic line from the accumula-
tors or brake system until all hydraulic pressure
has been manually drained from accumulators.
Open manual drain valves located on the brake
manifold in the brake cabinet to drain pressurized
oil. The manual bleeddown valve for the rear accu-
mulators is identified as “NV1”. The manual bleed-
down valve for the front accumulators is identified
as “NV2”.
Brake Accumulator Bleed Down Procedure
The four brake accumulators can be bled down by
rotating the manual bleeddown valves (NV1 and NV2)
counterclockwise. The valves are located on the brake
manifold in the hydraulic brake cabinet.
1. Turn handles counterclockwise to open valves.
2. Confirm accumulators are bled down by applying
the “Brake Lock” switch (key switch “On”, engine
shut down) and applying service brake pedal. The
service brake light should not come on.
3. Close the bleeddown valves by rotating clockwise.
ACCUMULATORS -
HYDRAULIC COMPONENTS CABINET
Removal
1. Shut down engine to bleed steering accumulators.
Exhaust all pressure from the brake system by
opening accumulator manual drain valves.
2. Remove the valve guard and “Dyna-seal” from top
of accumulators.
3. Depress valve core to release gas precharge
pressure from accumulator bladder. (Refer to Fig-
ure 3-13).
4. Remove accumulator mounting bracket. Loosen
and remove accumulator from the brake mani-
fold. Plug opening on brake manifold to prevent
contamination.
5. Transfer accumulator to work area.
Installation
1. After service repairs or bench test has been
completed, move the accumulators to the brake
control cabinet. DO NOT precharge accumula-
tors on the bench test.
2. Position the accumulators on the brake manifold.
Tighten fittings securely. Install mounting brack-
ets. Secure mounting brackets in place with cap-
screws and lockwashers. Tighten capscrews to
standard torque.
3. Refer to “Charging Procedure” in this section.
4. Replace “Dyna-seal” and valve guard on top of
accumulators.
Disassembly
1. Securely clamp accumulator (preferably in a chain
vise). Make sure accumulator shell is suitably
protected by strips of padding or soft metal on vise
base.
2. Remove core from gas valve using valve core tool.
(Refer to Figure 3-13).
3. Remove pipe plug from plug & poppet assembly.
4. Remove locknut from plug and poppet assembly
using a spanner wrench and an adjustable
wrench. One for torque and one for counter-
torque. (Refer to Figure 3-14).
5. Remove spacer, Figure 3-15.
6. With palm of hand, push plug and poppet assem-
bly into the shell.
7. Insert hand into shell and remove O-ring, washer
and anti-extrusion ring from plug. Fold anti-extru-
sion ring to enable removal. (Refer to Figure
3-16).
FIGURE 3-13. VALVE CORE REMOVAL
J3-22
Brake Circuit Component Service
J03019 1/99
Summary of Contents for 930E-2
Page 1: ......
Page 2: ......
Page 4: ...NOTES ...
Page 8: ...KOMATSU MODEL 930E Dump Truck A 4 Introduction A00017 03 01 ...
Page 10: ...NOTES A1 2 Index A01001 2 94 ...
Page 12: ...930E MAJOR COMPONENTS A2 2 Major Component Description A02055 ...
Page 35: ...START HERE Walk Around Inspection A03017 General Safety and Operating Instructions A3 21 ...
Page 46: ...NOTES A3 32 General Safety and Operating Instructions A03017 ...
Page 78: ...NOTES B1 2 Index B01016 ...
Page 88: ...NOTES B3 6 Dump Body B03013 03 01 ...
Page 92: ...NOTES B4 4 Fuel Tank B04015 ...
Page 94: ...NOTES C1 2 Index C01021 03 01 ...
Page 118: ...NOTES C5 6 Air Filtration System C05013 5 98 ...
Page 126: ...NOTES D2 6 24VDC Electric Supply System D02018 ...
Page 142: ...NOTES D3 16 24VDC System Components D03019 04 01 ...
Page 146: ...FIGURE 2 1 PROPULSION SYSTEM DIAGRAM E2 2 Electrical Propulsion System Components E02014 3 01 ...
Page 196: ...NOTES E2 52 Electrical Propulsion System Components E02014 3 01 ...
Page 240: ...NOTES E3 44 AC Drive System Electrical Checkout Procedure 3 01 E03015 Release 17 Software ...
Page 242: ...NOTES G1 2 Index G01017 ...
Page 250: ...NOTES G2 8 Tires and Rims G02015 ...
Page 274: ...NOTES H1 2 Index H01013 04 01 ...
Page 282: ...NOTES H2 8 Front Suspensions H02013 2 01 ...
Page 288: ...NOTES H3 6 Rear Suspensions H03013 ...
Page 334: ...NOTES J3 32 Brake Circuit Component Service J03019 1 99 ...
Page 378: ...NOTES L2 8 Hydraulic System L02028 ...
Page 401: ...FIGURE 4 5 FLOW AMPLIFIER VALVE L04031 Steering Circuit L4 7 ...
Page 403: ...FIGURE 4 6 FLOW AMPLIFIER NO STEER L04031 Steering Circuit L4 9 ...
Page 405: ...FIGURE 4 7 FLOW AMPLIFIER LEFT STEER L04031 Steering Circuit L4 11 ...
Page 407: ...FIGURE 4 8 FLOW AMPLIFIER RIGHT STEER L04031 Steering Circuit L4 13 ...
Page 409: ...FIGURE 4 9 FLOW AMPLIFIER NO STEER EXTERNAL SHOCK LOAD L04031 Steering Circuit L4 15 ...
Page 414: ...NOTES L4 20 Steering Circuit L04031 ...
Page 422: ...NOTES L5 8 Steering Control Unit L05021 ...
Page 429: ...L06021 Steering Circuit Component Repair L6 7 ...
Page 450: ...NOTES L6 28 Steering Circuit Component Repair L06021 ...
Page 466: ...NOTES L7 16 Hoist Circuit L07023 ...
Page 492: ...NOTES L9 6 Hydraulic System Filters L09008 ...
Page 504: ...NOTES L10 12 Hydraulic Check out Procedure L10012 ...
Page 508: ...NOTES M1 2 Index M01034 03 01 ...
Page 518: ...NOTES M2 3 10 Ansul Checkfire Electric Detection and Actuation System M02003 ...
Page 524: ...NOTES M5 4 Wiggins Quick Fill Fuel System M05002 10 96 ...
Page 532: ...NOTES M8 8 Special Tools M08012 9 99 ...
Page 560: ...NOTES M9 28 Air Conditioning System M09010 6 97 for HFC 134a Refrigerant ...
Page 618: ...M20 20 Payload Meter II M20007 10 00 ...
Page 619: ...M20007 10 00 Payload Meter II M20 21 ...
Page 627: ...M20007 10 00 Payload Meter II M20 29 ...
Page 634: ...NOTES N1 2 Index N01020 03 01 ...
Page 654: ...NOTES N3 6 Cab Components N03011 7 98 ...
Page 660: ...NOTES N4 6 Operator Comfort N04020 ...
Page 686: ...NOTES N5 26 Operator Cab Controls N05044 ...
Page 688: ...NOTES P1 2 Index P01024 ...
Page 691: ...P02034 Lubrication and Service P2 3 ...
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Page 737: ...NOTES R1 2 930E Schematics R01048 with Cummins QSK60 Series Engine ...
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