BUNNING Lowlander MK4, Инструкция по эксплуатации

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LOWLANDER MK4 MANURE SPREADER – INSTRUCTION & SPARES MANUAL
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6.3.5 BASIC PNEUMATIC CHECKS
In order to perform some basic air checks, at least two good quality, calibrated air gauges are required, along with
their connecting hoses, and often a few extra assorted test points. The trailer should have test points positioned
around the system, so that tests can easily be carried out. All test points have the same size connecting thread
(M16x1.5) where the test hoses attach, and it is useful to have long test hoses so that two gauges can be positioned
close together and viewed simultaneously.
If there are no test points in the yellow line leading up to port 4 of the
RELSV (port in the top section), then a good alternative is to make up a test
coupling complete with a test point to fit between the tractor and the
trailer’s susie. These can have a male C-Coupling at one end, and a female
at the other, or suitable Palm Couplings if these are fitted.
These test couplings are useful to test the pressures coming from the
tractor, whilst still connected to the trailer.
Test 1 (Charging Test)
Disconnect the red susie from the tractor and drain all of the air from the trailer’s air tank(s) and attach one gauge to a
test point on one tank (fit test point if necessary – normally M22x1.5 threaded).
Fit a second air gauge in the red line (using male/female test coupling as described above), push in the shunt valve
button and reconnect the red susie. The button should pop out as the red susie is connected.
Have the two gauges side-by-side and monitor each gauge as the system charges up. You have to see the tank
pressure rise in line with the red line (it may be slightly behind), until the tank is fully charged and the tractor unloads
(blows off).
If the tank pressure is much lower than the red line pressure when the tractor unloads, then this indicates an internal
problem with the RELSV, or the pipe work leading to port 1 of it.
This pipe can be tested by disconnecting the red susie, and temporarily removing the pipe from port 1 of the RELSV
and replacing it with a new one. This new pipe can then be connected to the tractor’s red coupling, and the test
repeated.
If the pressures rise correctly, then examine any filters for blockages, and the original pipe work for kinks.
If the pressures still fail to equalize, then the RELSV has an internal fault. Repair or replace as necessary.
Test 2 (Red Line/Leak Test)
Fully charge the trailer and disconnect the red susie. A “chuff” of air should be heard as the air exits the open red line.
Observe the air gauge connected to the trailer’s air tank, and the pressure should drop momentarily, then stabilize.
If the tank pressure continues to drop, then check the open red line for the presence of air pressure (A new thin
rubber glove is ideal for this, as it can be attached to the open red susie and sealed with tape/cable tie and left. If it
inflates quickly, this indicates a leaking RELSV).
If no air is seen leaking from the open red susie, this indicates that the leak is downstream of the RELSV, and this is
best identified using a soap-water mixture. Pay particular attention to pipe fittings and note that these do not require
to be tightened too much, as their seals will often become damaged by over-tightening.
Finally, if the tank pressures drop very slowly over an extended period, then this is acceptable as long as the leaking is
not audible. This is known as “permissible leakage”.