Replace Fuel Pre-Filter Element - Hitachi ZW 550-6 Operator's Manual

Replace Fuel Pre-Filter Element

---every 500 hours or when fuel filter restriction
indicator is lit
IMPORTANT:
 Be sure to use only genuine Hitachi elements for
the fuel main filter element and the pre-filter
element. Failure to do so may lower engine
performance and/or shorten the engine service
life.
 Do not allow dirt and/or water to enter the fuel
system.
 Never pre-fill the filters.
Procedures:
1. Connect transparent drain hose (6) stored in the tool
box to drain (5).
2. Place 1 liter (1 quart) or larger capacity container
under drain hose (6) to hold the drained water.
3. Loosen air bleed plug (7) and drain (5). Drain fuel
until the filter is empty.
After draining fuel, remove drain (5) and replace the
gasket at drain (5).
4. Remove transparent filter case (11) using the
provided filter wrench.
5. When transparent filter case (11) is removed, the
element and O-ring for transparent filter case (11) is
exposed. Remove the element by hand.
IMPORTANT:
 When cleaning transparent filter case (11), use
clean diesel oil. DO NOT use acid or alcohols
solvent such as parts cleaning detergent, oil with
gas dryer, etc. These organic material may cause
cracks or cloud on the resin case.
 Do not overtighten the filter case.
6. Install a new element. Replace transparent filter case
O-ring and tighten transparent filter case (11) using
the special tool.
m : 30 ± 2 N·m (3±0.2 kgf·m, 22±1.5 lbf·ft)
Wrench size: 14 mm (0.55 in)
MAINTENANCE
7-64
Fuel Pre-Filter
4
7
11
5
6
115Z7B-7-59-1
115Z7B-7-59-2
95Z7-7-59-2