E-3 Defective Boom Kick-Out Function And Cancellation - Komatsu WA250-6 Shop Manual

SEN03848-00

E-3 Defective boom kick-out function and cancellation

Contents of
• Boom kick-out does not function or cannot be cancelled due to defective boom kick-out proximity
trouble
switch system, lift arm PPC detent system and lift arm detent relay system.
Related
information
Defective boom kick-out relay
1
(L113) (Internal trouble)
Possible
causes and
standard value
Defective detent active relay
in normal state
2
(Internal trouble)
Defective lift arm PPC detent
3
(Internal trouble)
Defective lift arm positioner
4 proximity switch (Internal trou-
ble)
14
40-400
Causes
a Prepare with starting switch OFF.
a Replace boom kick-out relay (L113) with normal relay.
a Operate boom kick-out with engine started.
Boom kick-out function is normal.
Boom kick-out does not function.
a Turn starting switch OFF, then carry out troubleshooting without
turning starting switch ON.
Between L113 (male) (1) and (2)
a Prepare with starting switch OFF.
a Solid part check.
Between
L113
(male) (3)
and (5)
a Prepare with starting switch OFF.
a Replace detent active relay (L115) with normal relay.
a Operate boom kick-out with engine started.
Boom kick-out function is normal.
Boom kick-out does not function.
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Between L115 (male) (1) and (2)
a Prepare with starting switch OFF.
a Solid part check.
a Applies impressed voltage between L115 (male) (1) – (2)
Between
L115
(male) (3)
and (5)
Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Between L36 (male) (1) and (2)
a Prepare with starting switch OFF.
a Interchange lift arm positioner proximity switch (F04) with bucket
positioner proximity switch (F03).
a Operate boom kick-out with engine started.
Boom kick-out function is normal.
Boom kick-out does not function.
400 Troubleshooting of electrical system (E-mode)
E-3 Defective boom kick-out function and cancellation
—
Standard value in normal state/Remarks on troubleshooting
Applies 24V impressed voltage
between L113 (male) (1) – (2)
Does not apply voltage between
L113 (male) (1) – (2)
Applies 24V impressed voltage
between L115 (male) (1) – (2)
Does not apply voltage between
L115 (male) (1) – (2)
1
Defective relay L113.
Relay L113 is normal.
Resis- 200 – 400
z
tance
Resis-
Max. 1 z
tance
Resis-
Min. 1 Mz
tance
Defective relay L115.
Relay L115 is normal.
Resis- 200 – 400
tance z
Resis-
Max. 1 z
tance
Resis-
Min. 1 Mz
tance
Resis-
30 – 50 z
tance
Defective boom kick-
out proximity switch
F04
Boom kick-out prox-
imity switch F04 is
normal.
WA250, 250PZ-6