Drain Fuel Filter; Bleed Air From The Fuel System - Hitachi ZW140-6 Operator's Manual

Drain Fuel Filter

--- every 10 hours (daily)
IMPORTANT: Drain fuel filter daily before starting
operation. The engine may be damaged if you do not
drain fuel filter daily.
Fuel pre-filter (1) has water separator function, which drains
water. Drain water when the engine trouble indicator
flashes.
Draining Procedures
1. Connect black drain hose (5) located in the tool box to
drain plug (3) under fuel pre-filter (1) and the case.
2. Loosen drain plug (3) to drain water.
Place a container to receive water for safety.
3. After draining water, securely tighten drain plug (3).

Bleed Air from the Fuel System

IMPORTANT: Air in the fuel system may make the engine
hard to start or make it run rough or not run at all.
After running the fuel tank dry, draining water from
fuel filter or fuel pre-filter (1) or replacing the fuel
filter, be sure to bleed the air from the fuel system.
If fuel contains high water content, check the fuel filter
earlier than the normal interval and drain water if
necessary.
1. Loosen air bleed plug (4), operate feed pump (2) until no
air bubble is observed in the fuel from the air bleed plug.
2. After no air bubble is spouted from air bleed plug (4),
tighten air bleed plug (4) and operate the feed pump
until it becomes difficult to move.
3. Once the feed pump becomes difficult to move, push the
disk part of feed pump (2) back to the original position.
4. Start the engine. Check the fuel supply system for fuel
leaks.
MAINTENANCE
7-67
Pre-Filter Main Filter
4
2
3 1
1
3
5
MPTC-07-044
MPTC-07-045
MNDB-07-025