Flow 94i-D, Руководство пользователя

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Shift valve
The most common shift valve problems are leaks due to
worn o-rings and sticking of the spool in the body due
to contaminated oil. See
Cleaning a contaminated hy-
draulic system .
Service steps
1. Shut down the system.
WARNING
The shift valve is specially modified for this application. Us-
ing a substitute shift valve can create a potential safety haz-
ard, will lower the performance of your pump and void
your warranty.
Place the main electrical disconnects in the OFF
position and bleed down all high-pressure lines. Place Out
of Service tags on the main electrical disconnects and lock
them out. Failure to do so can result in equipment damage
or injury to personnel.
When the pump is operating, the manifold assembly
can contain up to 3500 psi (241 bar) oil pressure.
NEVER start or operate the pump when any of the
manifold assembly parts are loose or removed.
Note: When working on the shift valves, drain the
oil from the reservoir into a clean container able to
hold 37 gallons (140 L).
2. Remove the pilot valve by unscrewing the four cap
screws (
5
32
-in. socket) in a figure-8 pattern in
1
8
-turn
increments until all torque has been removed. Set
the valve aside.
3. Remove the four cap screws (6 mm socket) that hold
each shift valve end cap in place; remove the end
caps.
4. Use your fingers to make sure the shift valve spool
moves freely in the valve body. The spool must
move with light pressure through its full stroke of
10 mm.
5. Remove the spool and make sure the spool grooves
are clean and the polished surfaces are undamaged.
Check the inside of the shift valve body for any
damage or foreign objects. Inspect the end cap
o-rings for damage and replace as necessary.
6. Loosen the cap screws (4 screws with
5
16
in. socket
and two with
3
16
in.) on the shift valve in
1
8
-turn in-
crements until all torque is removed. Remove the
shift valve body from the manifold.
64 | M-390
© Flow International Corporation
HYPERJET™ 94i-S AND 94i-D PUMPS