Check Pressure Switch - Allis-Chalmers HD-5 Manual

has run down. The clock has been adjusted
to run a little slow to compensate for the
overrun.
All hands move clockwise. The small indica-
tor (upper left) visibly turns when the meter
is recording. These meters record up to 10,-
000 hours and repeat. The four flgures of
the hours of operation are read from the
three hands as follows:
1 9 5 5
U" ",mb" p"."d "" 1,000
t
1
hour (inner) track here
Use number passed on 100
hour (middle) track here
Use number passed on 10 hour
(outer) track h e r e - - - - - - - - - '
Use number of marks passed
beyond last flgure on 10 hour
track here _ _ _ _ _ _ _ _ _ _ _ _
..J
L::: _ _ _ _ _
Fig. 3 -
Hour Mefer-----~
2. Installation.
On early model fractors, the hour meter was
mounted on the primary fuel filter bracket
located on the left side of the engine. On
later models, the hour meter is mounted on
a rubber mounting in the left battery box.
The rubber mounting is designed to minimize
hour meter vibration and shock.
To install the hour meter (later models). Re-
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tH~LinERS (~
H IJ 5· III
fiSH
HOUR METER
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'--_ _ _ Fig, 4-Hour Meter Locotion _ _ _
......1
190
move the left battery box cover and "knock_
out" plug from the battery box. Clamp the
hour meter and rubber mounting in place
with the attaching screws. Ground the short
wire (black) from the hour meter to the inner
top of the battery box with the screw pro-
vided. Thread the long wire (red) through
the battery box, under the floor plate and
through the cowl for installation on the pres-
sure switch. Install the adapter fitting and
pressure switch on the back oUhe oil pressure
switch of the oil pressure gauge. Install the
free end of the long wire (red) on one termi-
nal of the pressure switch. Install the remain-
ing wire (black and gray) to the other termi-
nal of the pressure switch and the left (viewed
from rear) terminal of the ammeter. Install
the battery box cover.
3. Inspection.
Inspect all hour meter wiring for poor terminal
connections, a loose joining connection, bare
wires (particularly near wire clips), frayed
and oil soaked wires. Replace if necessary.
4. Check Pressure Switch.
To check the pressure switch (mounted ;n the
oil pressure line). Remove the wire, leading
from the pressure switch to the hour meter
from the pressure switch. Connect a 12 volt
test lamp (a 12 volt tail light bulb will work)
to the pressure switch terminal, in place of
the wire that was removed, and ground the
other end of the test lamp wire to the engine
or main frame. Start the engine. If the lamp
fails to light, the switch is inoperative, and
must be replaced.