Boss Industries BA435 Piston, Service And Maintenance User Manual

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Description of Components

Compressor Assembly - 

The Boss BA435 hydraulic drive piston compressor assembly is a positive

displacement, intermittent-flow, reciprocating unit.  The piston compressor consists of a crankshaft, oil filter,
oil pump, four connecting rods, pistons, cylinders, and valve assemblies.  As the crankshaft rotates, the
pistons move up and down.  As they move down, a vacuum is created above the piston which allows the
reed valve to open and fill the area above the piston with air.  When the pistons move back up, this air is
discharged from the compressor.  Oil lubricates the bearings and cylinder walls as the crankshaft rotates,
ensuring that the system stays cool.

Hydraulic Oil Cooling Systems

 - The compressor cooling system consists of a hydraulic cooler mounted

on the compressor frame. Cool air is drawn through the vented end panel and flows over the compressor
surface and through the hydraulic cooler, exiting out the front vented panel . Allow for adequate clearance
(10”) for the air to exit.  Also, the package location should not be subjected to air temperatures above
ambient.

Dipstick 

- The dipstick indicates the fluid level in the crank case. Proper level should be at the “FULL” line

on the dipstick. Check this level when the compressor is disengaged and the vehicle is parked on level
ground. Fluid level should be checked prior to each use.

Electrical System - 

The Boss compressor’s standard electrical system consists of:

-Hydraulic oil cooler fan assembly and relay.
-12VDC N.O. hydraulic solenoid.
-Switch relay for customer equipment interface during compressor operation.

Most air tools operating pressure range is between 90 and 125 psi.
Operating above the tools’ recommended pressures will decrease the life
of the tool. Higher operating pressure can also over torque nuts and bolts
fatiguing the fastener and mating parts. Strictly adhere to tool operating
pressures and torque standards set forth by the tool manufacturer and the
specifications of the equipment that work is being performed on.

Pressure Switch - 

The pressure switch is a N.C. electrical switch set to open at 150 PSI and set to close

at 115 PSI.  The pressure switch controls the N.O. hydraulic solenoid. If service air pressure is under 150
PSI, the pressure switch will remain in its normally closed state, keeping the N.O. hydraulic solenoid closed
and the compressor producing air. If the service valve is closed or the tool using the air is off, service line
pressure will rise to 150 PSI. This will cause the pressure switch to open and deactivate the hydraulic
solenoid.  The compressor will stop making air.  If the tool is turned on or the service valve is opened, the
service line pressure will drop.  When the pressure falls to 115 PSI, the pressure switch will close, energiz-
ing the N.O. hydraulic solenoid forcing flow to the motor and the compressor will start producing air to
meet the demand.

Never adjust the pressure switch to a setting of greater than 150 PSI.  Oper-
ating the compressor at greater than 150 PSI may result in personal injury and
property damage.