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Groeneveld Auto Greaser - Pump Unit
1.
Reservoir with follower plate
2.
Air venting channel
3.
Grease channel
4.
Return channel to reservoir
5.
Main line connection
6.
Pressure channel
7.
Return valve
8.
Non-return valve
9.
Compressed air connection
10.
Main air piston
11.
Spring
12.
Filler connector
13.
Small grease piston
14.
Grease chamber
15.
Flapper valve
16.
Connection to reservoir
Pump Unit Operation
The timer counts down the preset interval and then
closes the circuit applying power to the solenoid,
opening it and allowing air pressure to enter through
the bottom of the pump unit.
The air pressure is applied via the compressed air
connection (9) the main piston (10) will be forced
upwards applying pressure to the lubricant in
chamber (14).
The pressure in chamber (14) forces valve (15)
against the seat. The connection (16) to the reservoir
(1) is closed so the grease does not pump straight
back into the reservoir.
The lubricant leaves the chamber (14) via a channel
(3) through the non-return valve (8) into the main
or primary line. It moves along the main lines under
pressure and acts on the plungers in the metering
units.
The metering units are brought under full pump
pressure passing their metered quantities of lubricant
into the lubrication points. As a result of the pressure
differential at the return valve (7) the return channel
(4) remains closed.
G4.7, G5, G6 Crop Cruiser Operator's Manual MY19 - REV 0
Above: Pump unit exploded view
At the end of the complete 3 minute lubrication
cycle, the air pressure under the main piston (10)
falls, allowing the piston to be pushed downward by
the spring (11). At the same time flapper valve (15)
is released and, because of the reduced pressure
in the chamber (14), lubricant is drawn from the
reservoir. This primes the system for the next cycle.
The non-return valve (8) prevents grease from the
system piping and metering units from flowing back
into the chamber (14).
The pressure in the main pipe opens the return
valve (7) via the channel (6). This allows the pressure
of the lubricant to flow via the channel (4) to the
reservoir.
The metering units, with this pressure drop can now
automatically refill themselves. The springs inside the
meter units push the plunger back and the reservoir
in front of the plunger fills, priming it for the next
cycle.
There is NO pressure relief valve for the grease.
Once the system has expended all the grease in the
meter units, the system hydraulically locks until the
end of the cycle time.
Continued over page
Chapter 12 - Optional Accessories - 181
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Troubleshooting
