TM 5-2420-230-24-1
Maintenance & Service Manual
R & HR32000 3 & 6 Speed LD
IMPELLER HUB & TURBINE HUB ASSEMBLY WITH BACKING
RING AND SPECIAL SELF LOCKING SCREWS.
1. CLEAN HUB MOUNTING SURFACE AND TAPPED HOLES WITH SOLVENT. DRY THOROUGHLY
BEING CERTAIN TAPPED HOLES ARE DRY AND CLEAN.
2. INSTALL BACKING RING AND SPECIAL SCREWS TO APPROXIMATELY .06 INCH [1,5] OF SEATED
POSITION. WITH A CALIBRATED TORQUE WRENCH, TIGHTEN SCREWS 4O TO 45 LBS. FT TORQUE
[54,3-61,0 N.m]. NOTE: ASSEMBLY OF IMPELLER OR TURBINE HUB MUST BE COMPLETED WITHIN A
FIFTEEN MINUTE PERIOD FROM START OF SCREW INSTALLATION. THE SCREWS ARE PREPARED
WITH A COATING WHICH BEGINS TO HARDEN AFTER INSTALLATION IN THE HUB HOLES. IF NOT
TIGHTENED TO PROPER TORQUE WITHIN THE FIFTEEN MINUTE PERIOD, INSUFFICIENT SCREW
CLAMPING TENSION WILL RESULT. THE SPECIAL SCREW IS TO BE USED FOR ONE INSTALLATION
ONLY. IF THE SCREW IS REMOVED FOR ANY REASON IT MUST BE REPLACED.
THE COMPOUND LEFT IN THE HUB HOLES MUST BE REMOVED WITH THE PROPER TAP AND
CLEANED WITH SOLVENT DRY HOLE THOROUGHLY AND USE A NEW SCREW FOR
REINSTALLATION.
-64
F-109
