
To prime system
Supply lines
After pump reservoir has been filled with
recommended lubricant, remove all plugs in
dead ends of injector manifolds and supply
lines. Turn vent plug in pump counter-
clockwise one complete turn. Operate pump
until lubricant flows freely from vent plug
opening to expel air pockets trapped
between pump and supply line connection.
Tighten vent plug. Continue operating pump
until lubricant flows from any plug opening.
Close opening with plug. Repeat procedure
until all plug openings are closed and supply
lines are primed.
Feeder lines
Fill each feed line with lubricant before
connecting lines to outlet of injectors and
bearings. This will prevent having to cycle
each injector repeatedly to fill feed line
between injector and bearing.
WARNING
Safety unloader requires no adjustment
and should not be tampered with.
Failure to comply may result in death
or serious injury.
Operation
Operation of model pump is fully
automatic, controlled by or volt DC
electric timer and electric operated solenoid
air valve. As truck operates, timer
periodically turns on switch that energizes
solenoid air valve. Solenoid air valve opens,
and admits regulated air to Centro-matic
pump, closing vent valve. Pump begins to
operate, delivering lubricant through supply
lines to each lubricant injector.
As pump builds up pressure, a measured
amount of lubricant is dispensed to bearings
by each injector. After all injectors have
cycled, lubricant pressure rises rapidly to
psi (165 bar) with air regulated to
psi (4 bar), and pump stalls against
pressure.
Timer switch contact is broken, and
solenoid air valve is de-energized, shutting
off air supply; air then exhausts from pump
and vent valve assembly. As air is relieved,
vent valve opens and lubricant pressure in
system vents back through supply line to
lubricant reservoir. Injectors reload, and
system is ready for next lubrication cycle.
Injectors
Check each individual injector for proper
operation.
Vent valve
Vent valve () is operated by compressed
air from same source that operates pump.
When pump is in operation, air pressure
keeps vent valve closed and lubricant is
directed through outlet and to injectors.
When air to pump is shut off, vent valve
opens and supply line pressure vents back
into reservoir.
Safety unloader
Safety unloader () is provided at pump
outlet to prevent build up of dangerously
high lubricant pressure in system.
It is factory set to open at approximately
to psi (258 to 293 bar).
Change pump to new
series follower
configuration
Use follower upgrade kit .
Remove bushing (), washer
assembly and retaining ring
() from old follower assembly.
Place follower washer () on lower
side of follower packing (), making
sure top follower washer is still in place.
Place o-ring ()into bushing.
Place gasket () on bushing ().
Place bushing and gasket into assem-
bled follower packing and washers.
Place drops of blue Loctite at
° apart on threads of bushing.
Assemble nut () to bushing
and tighten.
Place hex of bushing in vice and tighten
nut to in-lbs (± in-lbs).