Cleaning and Inspection
NV4500 - Manual TransmissionCLEANING
Clean the gears, shafts, shift components and transmission housings with a standard parts cleaning solvent. Do not use acid or corrosive base solvents. Dry all parts except bearings with compressed air.
Clean the shaft bearings with a mild solvent such as Mopar degreasing solvent, Gunk or similar solvents. Do not dry the bearings with compressed air. Allow the bearings to either air dry or wipe them dry with clean shop towels.
INSPECTION
NOTE: Minor corrosion, nicks, or pitting can be smoothed with 400 grit emery and polished out with crocus cloth.
Inspect the reverse idler gear, bearings, shaft and thrust washers. Replace the bearings if the rollers are worn, chipped, cracked, flat-spotted or brinnelled. Replace the gear if the teeth are chipped, cracked or worn thin.
Inspect the front bearing retainer and bearing cup. Replace the bearing cup if scored, cracked, brinnelled or rough. Check the release bearing slide surface of the retainer carefully. Replace the retainer if worn or damaged in any way.
Inspect mainshaft bearing surfaces, splines, snap ring grooves and threads. Replace the shaft if any surfaces exhibit considerable wear or damage.
Inspect the countershaft and bearings. Replace the shaft if any surfaces exhibit considerable wear or damage.
Inspect shift forks for wear and distortion. Check fit of the sleeve in the fork, to be sure the two parts fit and work smoothly. Replace the fork if the roll pin holes are worn oversize or damaged. Do not attempt to salvage a worn fork. Replace shift fork roll pins if necessary or if doubt exists about their condition.
The all bearings for wear, roughness, flat spots, pitting or other damage. Replace the bearings if necessary.
Inspect the blocker rings and fiction cones, replace either part if worn or damaged in any way. Replace if the friction material is burned, flaking off or worn.
Inspect synchro components wear or damage. Replace parts if worn, cracked or distorted.
Inspect all of the thrust washers and locating pins. Replace the pins if bent or worn. Replace the washers if worn or the locating pin notches are distorted.
Inspect the case and housing/adapter sealing and mating surfaces are free of burrs and nicks. Inspect the alignment dowels in the case top surface and in the housing/adapter are tight and in good condition. Replace the gear case or housing/adapter if cracked or broken.