HYDRAULIC CONTROL VALVE (Gresen)
NOTE:
Melroe Control Valve repair
procedure
can be
found
in the
Component
Repair Manual.
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-{)888
Checking The Relief Valve
The tools listed will be needed to do the following
procedure:
OEM1238 -
Hydraulic Tester
MEL
10006 - Hydraulic Test Kit
Stop the engine. Move the auxiliary control (right steering
lever) to release the hydraulic pressure.
Lift and
block the loader. (See PREVENTIVE
MAINTENANCE Section 1 for the correct procedure.)
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-Q286
Connect the hydraulic tester to the auxiliary couplers [A).
Start the engine and run at idle.
Engage the right steering lever into detent position.
Watch the flow of the
hydraulic tester to be sure it is
correct.
Increase the engine RPM to maximum.
Turn the restrictor control, at the tester, to increase the
pressure until the main relief valve opens.
The correct pressure is
2250-2400
PSI (15167-16546
kPa) free flow.
If
not, stop the engine.
Replace or adjust the main frame relief valve. (See Page
2-9
.)
Revised Sept. 90
-2-7-
A
WARNING
When an engine
is
running
in
an
enclosed
area,
fresh
air
must
be added
to
avoid
concentration
of
exhaust
fumes.
If
the
engine
is
stationary,
vent
the
exhaust
outside.
Exhaust
fumes
contain
odorless,
invisible
gases
which
can kill
without
warning.
W-205Q-1285
741
, 742, 743, 743DS
Bobcat
Loader
Service
Manual
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