Hatz 3H50 Series, Manual, Page: 108 / 132

Maintenance 3H50, 4H50
108 HATZ Manual
Procedure
Step Activity
1 Lock the fuel supply line on the fuel prefilter.
2 Place a suitable container under the filter to collect emerging
fuel.
3 Disconnect the water level sensor cable (4) from the drain plug
(3).
4 Release the drain screw (3) and drain the fuel.
5 Unscrew the fuel prefilter. Completely unscrew the drain plug
with integrated water level sensor
6 Dispose of the used fuel prefilter according to local environmen-
tal regulations.
7 Clean the drain plug with integrated water level sensor and
lightly oil the sealing surfaces. Screw the drain plug into the new
fuel prefilter.
8 Lightly oil the gasket (6) of the new fuel prefilter, fit the dry filter
and tighten it
by hand .
9 Release the fuel feed line and connect the cable of the water
level sensor.
10 Start the engine and perform a test run.
NOTE : When starting the engine, adhere to the procedure in
" 6.6 Starting the engine for the first time or after a fuel filter re-
placement, page 56 ".
11 After the test run, check the fuel prefilter and drain plug for
leaks, tighten by hand if necessary.
8.2.14 Changing the main fuel filter
Safety notes
DANGER
Fire hazard from fuel
Leaked or spilled fuel can ignite on hot engine parts and cause
serious burn injuries.
▪ Do not spill fuel.
▪ No open flames when working on the fuel system.
▪ Do not smoke.