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6.5 Machines ready for attachments
1. Stop valve (1)
This valve stops the flow of the hydraulic oil to the attachment.
There is one on each side of the arm.
(1) Free:
Hydraulic oil flows
(2) Lock:
Hydraulic oil stops
WARNING
Before removing or installing any attachment be sure to
release any pressure in the piping as follows:
Run the engine for at least one minute. Keep the safety lock
lever in the free position.
Stop the engine and immediately return the key to the "ON"
position.
Operate the control for the attachment circuit in both direc-
tions. Example: If removing a clamshell bucket be sure to
operate both left and right rotation using the buttons on the
right lever, as shown in "Handling the clamshell bucket
(6-13)". Also be sure to move the lever to the left and right to
release pressure in the bucket open/close circuit.
Note that this does not completely release the pressure, so
when detaching hoses or hydraulic fittings loosen the con-
nections slowly and do not stand in the direction in which the
oil will spurt out.
When removing or installing attachments, set this valve to the
LOCK position after releasing the pressure in the circuit.
2. Accumulator (for control circuit) (2)
WARNING
The accumulator is charged with high-pressure nitrogen gas,
and it is extremely dangerous if it is handled mistakenly.
For details of handling, see "Handling accumulators (3-94)".
This is installed to release any remaining pressure in the attach-
ment circuit after the engine is stopped. Normally, do not touch
it.
6-12
Attachments, Options
2
1
2
PW180-7E0 – VEAM400102
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