70 Class Machines Maintenance

LUBRICATION
1) In the lubrication of the machine the oil is metered, feeding oil in proper amounts to all bearing surfaces. It is a one-way oiling action and when the reservoir supply is used, the machine must be refilled. The reservoir holds enough for 40 hours of seaming.

2) Oil is filled through a hole under the Cap Screw of the Oil Filler Assembly into the main reservoir. About 8 ounces (0.250 litres) of a high grade turbine oil of about 150 Sayboldt seconds at 100 degrees Fahrenheit (37.5 degrees C) is recommended. Toe drain the oil, dismount the machine and extend the feed mechanism end of the machine over the end of the table. After providing a means of catching the oil, unscrew the Oil Drain Screw 11-3/8 (located at the rear of the machine in the base) several turns.

3) The oil coming up from the reservoir is filtered by a bronze screw-type filter located in the frame above the Oil Reservoir Plate.

4) The Upper Shaft Pump provides a continuous oil flow to assure proper lubrication without the use of wicks. The Pump is operated from an eccentric groove in the main Upper Shaft. The Upper Shaft Pump draws oil from the main reservoir and forces it through the Oil Bubbler Pipe to the Oil Bubbler Pipe Cap. Some oil is bypassed from the Oil Bubbler Pipe to the Feed Carrier Oil Meter Holder and to the Upper Shaft Oil Meter Holder.

FRAME CAP LUBRICATION
Feed Carrier Oil Feeder Tube supplies oil to the Upper and Lower Looper Carrier Assemblies and the Cam Roll Bearings. The oil flows to the Feed Carrier Oil Feeder Tube through an oil meter which is enclosed in the Feed Carrier Oil Meter Holder. The Feed Carrier Oil Meter Holder is located in the frame beside the Upper Shaft Oil Pump Screw.

UPPER SHAFT LUBRICATION
The oil bypassed through the Oil Bubbler Pipe fills up the Upper Shaft Oil Meter Holder cavity and a limited amount flows through an oil meter in the Holder. The oil drops into the Upper Shaft Oil Collector and is fed past the Oil Distributor Rod located in the Upper Shaft. This action distributes the oil to the bearing surfaces of the main shafts on the left end of the machine, the Needle Carrier Assembly, the Upper Cutter Carrier Assembly, and the Feed Mechanism.

Some of the oil not fed into the Oil Bubbler Pipe is forced along the outside of the Upper Shaft, to the face of the Upper Cam Boss.

LOWER SHAFT LUBRICATION
The Lower Shaft is lubricated by oil flowing into the Lower Shaft Oil Meter Holder through an oil meter to the Lower Shaft. This Meter Holder is located in the frame between the right Upper and Lower Shaft Holes (note Section 73, line i.).

OIL METERS
5) There are four grades available for various rates of oil flow.

6) Oil Meters in the machine are selected at the factory to provide proper lubrication for normal machine uses.

7) If the machine is to be used in wet locations or wet cloth is to be sewn, then the Feed Carrier Oil Meter and Upper Shaft Oil Meter should be changed to grade “A” (coarse).

8) The following precautions are recommended:

1. Never allow the oil level to go below the empty “E” line on the Oil Gage.
2. Occasionally clean the lint around the Feed Dogs and from behind the Dust Shield (do not use compressed air).
3. Clean screen on the Oil Filter Assembly if filling the machine becomes difficult.
4. To clean the screen, unscrew this assembly from the machine and clean with compressed air or a solvent.
5. The Inlet Oil Filter is located inside the main reservoir. This may be replaced by removing the Oil Reservoir Plate and unscrewing the filter. It may be cleaned by soaking in solvent and blowing through it with compressed air from the inside out. 

* This is not a complete list, and any high grade of spindle oil that meets the above viscosity recommendations can be used.