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Page 124
TROUBLESHOOTING
8. Compress the slave piston springs down
until the retainer is about 1/32 inch (1 mm)
below the retaining ring groove. Reinstall the
retaining ring. Be sure the retaining ring is
fully seated in the groove.
9. Remove the clamp fixture slowly to ensure
proper seating of the retaining ring.
FINAL TEST
Follow the instructions in the installation manual
to reassemble the J-Tech™ housings. Install a
new
oil supply seal ring.
1. Install the housings on the engine. Check
the valve yoke clearance and valve lash for
proper adjustment and then adjust the slave
piston clearance to the proper settings
shown in the table on page 122.
2. Before installing the engine covers, start the
engine and allow it to warm up for a few
minutes.
3. Depress the solenoid valve several times to
fill the housing with engine oil.
Engine brakes require a minimum oil pressure for
operation. If there is less than minimum at idle,
run the engine at higher RPM (800–900) when
making checks.
4. Check for oil leaks at the oil supply screw,
solenoid valve and housing pipe plugs. If
leakage is noticed, shut down the engine
and repair the leaks.
Some leakage will be seen at the master piston,
slave piston and control valves. This is normal.
Excessive leakage must be investigated (see
“J-Tech™ Checks (Hydraulic/Mechanical)”).
5. After final inspection and necessary repair,
shut down the engine and replace the
gaskets and covers.
6. Test drive the vehicle following the Test
Drive procedures (covered earlier) to verify
corrective action.
J-Tech™ Troubleshooting Guide
Following is a list of problem conditions showing
the probable causes and subsequent corrections.
ENGINE FAILS TO START OR STARTS AND
RUNS ONLY ON THREE (3) CYLINDERS
앫
Solenoid valve stuck in ON position
—
Ensure that electrical current is off to the
engine brake units. If the solenoid valve
remains on (cap down) with current off,
replace the solenoid valve.
ENGINE BRAKE WILL NOT OPERATE
앫
Blown fuse, open electrical leads
— Look
for a short circuit in the wiring. Replace any
broken, brittle or chafed wires. Check
solenoid tab for signs of shorting and
replace if necessary. Replace 10 amp fuse.
앫
On/Off switch, clutch switch or
multi-position switch out of adjustment
or defective
— Use a volt/ohmmeter to
make certain that there is electrical voltage
available at both terminals of each switch.
Readjust if needed or replace if voltage will
not pass through switch.
Do not touch electrical connection when
system is energized.
앫
Mounting bracket-to-rocker shaft
mounting screws loose or missing
—
Inspect for missing or loose mounting
bracket-to-rocker shaft screws. Repair as
required.
앫
Incorrect electrical power source
—
Check that the supply voltage is the
appropriate voltage. Recommended power
source is from the key switch ON position.
Ensure that power is not taken from a
source with an additional on/off switch, i.e.,
light switch. See solenoid specifications in
the table on page 121. Make sure wiring is in
accordance with MACK wiring instructions.
앫
Low engine oil pressure
— Determine oil
pressure at engine brakes (solenoid valve
and control valve). If oil pressure is below
specification, the engine should be repaired
in accordance with MACK procedures.
5-111.bk Page 124 Monday, July 10, 2006 2:26 PM
Содержание ASET AC
Страница 6: ...TABLE OF CONTENTS Page iii TABLE OF CONTENTS 5 111 bk Page iii Monday July 10 2006 2 26 PM...
Страница 14: ...INTRODUCTION Page 1 INTRODUCTION 5 111 bk Page 1 Monday July 10 2006 2 26 PM...
Страница 23: ...Page 10 NOTES 5 111 bk Page 10 Monday July 10 2006 2 26 PM...
Страница 24: ...VISUAL IDENTIFICATION Page 11 VISUAL IDENTIFICATION 5 111 bk Page 11 Monday July 10 2006 2 26 PM...
Страница 28: ...DESCRIPTION AND OPERATION Page 15 DESCRIPTION AND OPERATION 5 111 bk Page 15 Monday July 10 2006 2 26 PM...
Страница 96: ...COMPONENT LOCATOR Page 83 COMPONENT LOCATOR 5 111 bk Page 83 Monday July 10 2006 2 26 PM...
Страница 99: ...Page 86 NOTES 5 111 bk Page 86 Monday July 10 2006 2 26 PM...
Страница 100: ...TROUBLESHOOTING Page 87 TROUBLESHOOTING 5 111 bk Page 87 Monday July 10 2006 2 26 PM...
Страница 140: ...MAINTENANCE Page 127 MAINTENANCE 5 111 bk Page 127 Monday July 10 2006 2 26 PM...
Страница 153: ...Page 140 NOTES 5 111 bk Page 140 Monday July 10 2006 2 26 PM...
Страница 154: ...REPAIR INSTRUCTIONS PART 1 Page 141 REPAIR INSTRUCTIONS PART 1 5 111 bk Page 141 Monday July 10 2006 2 26 PM...
Страница 383: ...Page 370 NOTES 5 111 bk Page 370 Monday July 10 2006 2 26 PM...
Страница 384: ...REPAIR INSTRUCTIONS PART 2 Page 371 REPAIR INSTRUCTIONS PART 2 5 111 bk Page 371 Monday July 10 2006 2 26 PM...
Страница 454: ...REPAIR INSTRUCTIONS PART 3 Page 441 REPAIR INSTRUCTIONS PART 3 5 111 bk Page 441 Monday July 10 2006 2 26 PM...
Страница 479: ...Page 466 NOTES 5 111 bk Page 466 Monday July 10 2006 2 26 PM...
Страница 480: ...SPECIFICATIONS Page 467 SPECIFICATIONS 5 111 bk Page 467 Monday July 10 2006 2 26 PM...
Страница 505: ...Page 492 NOTES 5 111 bk Page 492 Monday July 10 2006 2 26 PM...
Страница 506: ...SCHEMATIC ROUTING DIAGRAMS Page 493 SCHEMATIC ROUTING DIAGRAMS 5 111 bk Page 493 Monday July 10 2006 2 26 PM...
Страница 513: ...Page 500 NOTES 5 111 bk Page 500 Monday July 10 2006 2 26 PM...
Страница 514: ...SPECIAL TOOLS EQUIPMENT Page 501 SPECIAL TOOLS EQUIPMENT 5 111 bk Page 501 Monday July 10 2006 2 26 PM...
Страница 519: ...Page 506 NOTES 5 111 bk Page 506 Monday July 10 2006 2 26 PM...
Страница 520: ...APPENDIX Page 507 APPENDIX 5 111 bk Page 507 Monday July 10 2006 2 26 PM...
Страница 528: ...INDEX Page 515 INDEX Index fm Page 515 Monday July 10 2006 2 48 PM...
Страница 535: ...Page 522 NOTES Index fm Page 522 Monday July 10 2006 2 48 PM...