Mode Of Function; Checking Oil Level And Oil Supply - DURKOPP ADLER 806 Service Instructions Manual

2.10.2 Mode of function

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26 27
35
34

2.10.3 Checking oil level and oil supply

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Oil supply from the sump to the sewing head
The oil passes from the oil sump to the cavity in the sewing head
through the spiral grooves in the hook driving shaft 19 and through the
duct 7. The check valve 9, contained in this duct, avoids the oil
backflow when the machine is out of operation.. The oil supply through
this duct can be controlled by the sight glass 5.
Most of oil delivered by the brass tube 4 flows into the bore hole of the
hollow shaft 3.. This hollow shaft contains a wick, that passes the oil to
the lubrication points of the foot lifting mechanism and to the sump in
the sewing head.
From here, the oil is conducted through the wicks to the articulations
of the foot lifting mechanism and to the rocker. The foot lifting
eccentric is lubricated by the wick 25, sucking the oil out of the cavity.
Oil supply from the machine head to the hook case
The oil splashed in the sewing head is picked up by the felt, passing
the oil to the lower wick, which in turn delivers the oil to the hook case.
The oil dropping from the brass tube 4 into the cavity is collected by
the felt plate 1, passing then via the duct 20 to the hook case.
Oil supply to the hook
The oil returned from the sewing head flows through the duct 32 into
the hook case. Here, the oil can rise up to the level of the suction
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pipe 31.
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The hollow hook shaft 23 conveys the oil via the spiral grooves of the
fixed shaft 33 to the upper vessel 26 of the hook. From here, the oil
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passes through the bore-hole 27 into the lower vessel 34. The smaller
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portion of this oil is conveyed by centrifugal force through an oil pipe
35 to the hook race. The major part of the oil flows again down and
lubricates the gears 30 and the ball bearing 28.
Oil backflow from the hook case to the oil sump
The pump 18 on the hook driving shaft sucks the oil from the hook
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case via the pipe 16 back to the oil sump.. The filter 14, contained in
33 this pipe, intercepts soil particles and avoids thus disturbances of the
pump functions. The pump 12 sucks the oil from the outer plastic tray
via the oil felt 15 and via the duct 15..
Caution: Danger of bodily injuries !
The machine must be in the position "Safe motor stop ".
–
Check the oil level in the oil sump through the sight glass 10 while
the machine is out of operation.
Top up if the oil level is in the lower third of the sight glass.
–
Check the oil supply to the sewing head through the sight glass 5
while the sewing machine is in operation, e.g. during the automatic
cycle.
–
Check the oil level through the sight glass 17 of the hook case
when the latter is in the sewing position and the sewing machine is
out of operation.