13. Slowly depress plunger to obtain pressure shown
in Table I on the “B1” pressure gauge:
Adjust screw plug in bottom port of differential
pressure switch counterclockwise until
switch contacts just close.
Table I - Differential Pressure Switch
Adjustment
Spring
Color
Pressure - Switch Contacts Closing
“B1” Valve Spool “B2” Valve Spool
Red
300
±
30 psi
(2 068
±
207 kPa)
300
±
30 psi
(2 068
±
207 kPa)
Green
600
±
50 psi
(4 137
±
345 kPa)
600
±
50 psi
(4 137
±
345 kPa)
14. Release plunger and depress again while observ-
ing “B1” gauge and ohmmeter to verify switch
contacts close at the pressure in Table I.
If not, repeat step 13.
15. Insert pry bar under pivot pin to actuate the “B2”
section of valve.
16. Slowly depress plunger while observing ohmme-
ter; switch contacts should close at the pressure
in Table I on the “B2” gauge. A slight adjustment
may be necessary.
17. Slowly depress both plungers equally from mini-
mum to maximum application pressure. Switch
contacts must remain open.
18. Install plug (6) and tighten to 90 - 100 in. lbs. (10.2
- 11.3 N.m) torque.
19. Shut down the test bench and relieve all hydraulic
pressure from the lines.
Avoid spillage and contamination! Avoid contact
with hot oil if the machine has been operating. The
oil will be at very high pressure.
Hydraulic fluid escaping under pressure can have
sufficient force to enter a person’s body by pene-
trating the skin and cause serious injury and pos-
sibly death if proper medical treatment by a
physician familiar with this injury is not received
immediately.
20. Remove hoses from valve and remove valve from
test stand. Refer to instructions below for pedal
actuator installation prior to final test.
Final Test and Adjustment
The brake pedal actuator must be installed on the
brake valve body prior to final test and adjustment.
Refer to “Installation of Brake Pedal Actuator to Brake
Valve”.
NOTE: The “Final Test and Adjustment” procedure
can also be performed with the brake valve installed in
the truck. To perform final test with brake valve
mounted in the truck, install valve per instructions in
“Installation”. Install 3000 psi (20 682 kPa) gauges at
the “B1” and “B2” diagnostic test connectors in the
brake cabinet. Follow steps 21. - 33. below for final
test.
21. Reinstall brake valve (with actuator pedal at-
tached) on the test stand following steps 2
through 9. under “Test Setup Procedure”.
22. With test stand pump adjusted for 2750 psi
(18,960 kPa) or with engine running and brake
system supply pressure at or above 2750 psi (18,
960 kPa), depress the pedal as quickly as possi-
ble. The pressure on the output circuits must
reach the minimum pressure listed below at port
“B1” and port “B2” within 1.0 second. Measure-
ment of time begins the moment force is applied
to move the pedal.
Rear Brake - “B1”: 2400
±
75 psi
(16,545
±
517 kPa)
Front Brake - “B2” : 2400
±
75 psi
(16,545
±
517 kPa)
23. With “B1” and “B2” plugged into a strip chart
recorder, (if available) check the modulation by
slowly applying pressure until the maximum pres-
sure is reached. Make sure the pressure increase
is smooth and no sticking of the spools is ob-
served. Fully depress the pedal. Pressures must
remain within specification at “B1” and “B2” for
20 seconds.
24. Adjust set screw (21, Figure 3-10) until the set
screw is not touching the actuator cap. Apply
Loctite
®
242 to the adjustment screw prior to
setting the deadband.
25. Set the deadband by placing a 0.010 in (0.254
mm) thick shim at location (9) between the pedal
structure and return stop boss on pivot structure.
26. Adjust the set screw (21) until the set screw is just
touching the cap.
J3-12
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 ...
Page 738: ......
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