l
HYDRAULIC PUMP (SIN 14999 & Below)
Checking The Output Of The Hydraulic Pump
(Cont'd)
Start the engine and run
at
low RPM.
If
no
flow is indicated
on
the tester,
the
hoses are
connected wrong.
Increase the engine speed to full
RPM*.
Warm the hydraulic fluid
to
140°F (60°C) by turning the
restrictor knob on
the
tester
to
about
1000
PSI (6895
kPa). DO
NOT
exceed system relief pressure
[A].
Open the restrictor and record the free flow (GPM)
at
full
RPM.
Activate the auxiliary hydraulics (right steering lever) into
the detent position. Record
the
highest pressure (PSI)
and flow (GPM) at full RPM.
The
high pressure flow must be
at
lest
80%
of free flow.
0/0
=
--=-H.:..:.;IG::::.:H:....:....::P=R:=:E=S.:::S?F-U::::R~E-:-F-:=:L::::O~W~(t...::G:.:..P..:.:M::..L)_
X
100
FREE
FLOW
(GPM)
A low percentage
may
indicate a failed hydraulic
pump
or
it
may
be caused by air in the system.
Make
sure that all
the air is removed from
the
system.
Removal And Installation
,
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
*See the SPECIFICATIONS Section 8
for
system relief
pressure and
full RPM.
The
system relief pressure
must
be per specification before
the
test is run.
Revised Sept. 90
-2-19-
8-04046
741,742,743, 743DS Bobcat Loader
Service Manual
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