DV11
Operation and Maintenance
151
Common Rail Fuel-injection System
Printed in Mar. 2005 PS-MMA0608-E1A
Possible cause : Solenoid valve sticking in “on” position.
Correction : If solenoid valve pin remains down with no electric current
being supplied, replace solenoid valve.
Possible cause : Center solenoid seal ring damaged. Allows oil to enter b
rake with solenoid valve closed.
Correction : Remove solenoid and replace all seal rings.
Possible cause : Solenoid valve exhaust plugged.
Correction : Remove any restrictions at exhaust (bottom) of solenoid
valve.
4) Engine brake slow to operate or weak in effect
Possible cause : Improper slave piston adjustment or slave piston binding i
n bore.
Correction: Readjust in accordance with procedures in this manual.
Ensure that slave piston responds smoothly to the adjusting
screw by loosening jam nut and turning the screw through its
full travel for full slave piston motion. Make sure piston
travels full range without binding or sticking
CAUTION:
Remove slave piston carefully when disassembly is necessary. Use the slave
piston removal tool. Slave piston springs are under heavy compression.
Possible cause : Lower solenoid seal damaged, allowing oil to exit housing.
Correction : Remove solenoid valve and replace all seal rings.
Possible cause : Solenoid screen clogged, stopping supply of oil to brake.
Correction : Remove solenoid valve and clean or replace screen.
Possible cause : Master piston not moving in bore.
Correction : Inspect master piston and bore for scoring or burrs. If
any present, clean surface with fine abrasive cloth. If u
nable to remove burrs, replace piston or housing. Inspe
ct lube oil for signs of contaminants, If any are present,
replace oil and filters and correct cause of contaminatio
n.
Possible cause : Control valves binding in housing bore.
Correction : Remove control valve. If body is scored, replace control
valve. Check for contaminants in lube oil. Clean housing
and control valve. If binding continues, replace housing.
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