TROUBLESHOOTING
H-2
H-2 There is excessive drop in engine speed, or engine stalls
* Carry out troubleshooting with the swing priority mode OFF and in the H/O mode.
* Check that the main relief pressure is normal.
Cause
Remedy
YES
I
Clogged throttle inside servo Clean
I
1 or &gged filter inside servo
1
,I
I
Is throttle inside
servo or filter
inside servo
clogged?
3YES
Does condition
yEs become normal when
2
- Tvc valve kWv0
valve assembly) is
- replaced?
_ Is engine speed at
NO arm relief normal?
NO
Defective lVC valve or
Mztive adjustment of TVC
Defective servo piston
I
’ I
I
- See below.
Adjust or
replace servo
valve assembly
Replace (piston
pump assembly)
-
* Replace the servo valve assembly on the defective side with a new part, and if the engine speed is lower than
the reference value below, carry out troubleshooting for S mode. If it is higher, it can be judged that the TVC
valve (servo valve assembly) is defective, so replace it.
Engine speed (reference) at arm relief when engine and pump are normal
Model
Engine speed at arm
relief
Conditions
1 i!E ~ 1 : .%~~l~~,“~~iti~~?N
11: ~~~~ 111
l Measure the speed at the point where the drop in engine
speed is greatest when the
arm cylinder is at the end of stroke
and the lever is operated slowly to the full position.
20-214
a
To Next Page
Loading...
Need help?
General
