BENDIX TCH-001-044 User Manual

Technical Bulletin

Bulletin No: TCH-001-044-A Effective Date: 2/1/98 Cancels: NA Page: 1 of 1

Subject:

UNLOADER PISTON CHANGE FOR THE TF-550/750
COMPRESSOR

A design change has been incorporated into the unloader piston complete of the Tu-Flo 550 and Tu-Flo 750 air
compressors. To minimize compressor unloader leakage a back-up ring was added to the unloader piston o-ring
groove. The back-up ring enhances the seal between the unloader piston and unloader bushing.

The new and old style unloader pistons are interchangeable without the need for additional modification to the
cylinder head. The new style unloader pistons are available in the following kits:

107515 Unloader Kit
107516 Cylinder Head Maintenance Kit

o-ring

back-up ring

unloader piston

New Style Unloader Piston