Preparation For Work - Hitachi ZAXIS 250LC-7 Operator's Manual

Preparation for Work

Before performing the maintenance procedures given in the
following chapters, park the machine as described below,
unless otherwise specified.
1. Refer to section on "Disassembling Procedure" to select
and prepare a crane with sufficient capacity.
2. Park the machine on a solid and level surface.
3. Turn the auto-idle switch OFF.
4. Move the engine control dial to the slow idle position.
Run the engine for 5 minutes to cool the engine.
5. Turn the key switch OFF to stop the engine. Remove
the key. In case the machine must be serviced with the
engine kept running, use a signal person.
6. Be sure to place pilot control shut-off lever (1) to the
LOCK position.
7. After putting a tag (2) for "Under Serving" on the easy-to-
see cab door or control lever, begin the work.
IMPORTANT:
 Be sure to coat the pins with grease before installing
them.
 Correctly close/open the stop valve and connect the
coupler.
If the front attachment is operated with the stop
valve kept closed or with the coupler loosened,
damage to either the cylinders or the pipe lines may
result.
 When installing the front attachment, if the front
attachment is operated without installing the
attached shims, damage to the pin holes may result.
 Be sure to clean the joints before connecting the
pipes.
Check if the O-ring to be installed in the joint is free
from any damage and is seated correctly.
 Tighten the hose connector with the specified
torque. Refer to the "Operator's Manual for Hitachi
Excavator" for tightening torque.
 Securely put plugs into the separated hose and
pipe ends so that dust does not enter the hydraulic
system.
DISASSEMBLING • ASSEMBLING
4-4
2
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MDFY-07-060-1 ja