Testing Leakage From Pressure Limiter And Return Rate From Injector - Komatsu 114E-3 Series Shop Manual

30 Testing and adjusting
Testing leakage from pressure
limiter and return rate from
injector
a Testing tools for leakage from pressure limiter
and return rate from injector
Symbol Part No.
1 795-790-4800 Hose kit
2 795-790-6700 Adapter
H
Commercially
3
available
k
Stop the machine on level ground and
make the work equipment touch down on
the ground.
1. Testing supply pump return rate
1) Disconnect return tube (1) of the supply
pump.
2) Connect hose kit H1 to the supply pump
side, and insert its tip into measuring cylin-
der H3.
3) Connect adapter H2 to the fuel return con-
nector side to block fuel leakage.
4) Connect INSITE (troubleshooting kit) to
the engine and set it so that it can check
the engine speed.
5) When the engine can be started, set "High
Pressure Leak Test" by INSITE (trouble-
shooting kit).
a By making setting as above, the fuel
high-pressure line at low idle is set to
150 MPa {1,500 kg/cm
6) Run the engine at low idle and test the
return rate from the supply pump.
a If the return rate from the supply
pump is in the following range, it is
normal.
Cranking
Low idle
114E-3 Series
Part name
Measuring cylinder
2 }.
Max. 200 cc/30 sec.
Max. 300 cc/30 sec.
k
When the engine cannot run, you
may test it by cranking the engine
with the starting motor. To protect
1
the starting motor, do not continu-
ously crank the engine 30 seconds
or more.
7) After finishing testing, remove the testing
tools and return the removed parts.
3
2. Testing leakage from pressure limiter
a If error code [449], [CA449] or [2311],
[CA2311] is indicated, carry out trouble-
shooting for it first.
1) Remove return tube joint bolt (2) of the
pressure limiter.
2) Connect hose kit H1 to the hole of
removed joint bolt (2) and put its end in
measuring cylinder H3.
3) Connect adapter H2 to the return tube
joint on the cylinder block side to prevent
the fuel from leaking.
SEN00455-01
Joint bolt (M14):
36 ± 5 Nm {3.67 ± 0.51 kgm}
19