HYDRAULIC CONTROL VALVE (Gresen) (Cont'd)
Main Relief Valve Removal
And
Installation
The tool listed will be needed to do the following
procedure:
MEL
1185
- Socket
Stop the engine. Activate the hydraulic controls to release
the hydraulic pressure.
Ra
ise the operator cab. (See PREVENTIVE
MAINTENANCE
Section 1.
IMPORTANT
When repairing
hydrostatic
and
hydraulic
systems, clean the
work
area before
disassembly and keep all parts clean. Always
use caps and
plugs
on
hoses, tubelines
and
ports
to
keep
dirt
out.
Dirt
can
quickly
damage
the system.
1-2003-0888
Loosen the relief valve [A).
Remove the relief
valve from the control valve [B).
Installation: When
installing the main relief valve always
use
new O-rings.
Clean and inspect the relief valve. Replace parts as
needed.
If
the pressure
is
not correct add or subtract shims (Item
1)
[C)
in
the relief valve.
Removal and Installation
A
WARNING
Put jackstands under the
front
axles and rear
corners
of
the
frame before
running
the engine
for
service. Failure
to
use
jackstands can
allow
the machine
to
fall
or
move
and
cause
injury
or
death.
W-2017-o286
Stop the engine. Move the foot pedals to release the
hydraulic pressure.
A
B
c
-2-8-
8-04910
I
8-01541
741, 742, 743, 743DS Bobcat Loader
Service Manual
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