SERVICING OF NOSE WHEEL ASSEMBLY

S/n	Work to be carried out	Tech	AME/ App. Person
I 1. 2 3 4 5 II 1 2	DIS-ASSEMBLY: Completely deflate tyre and tube and break loose tyre beads. Extreme care must be taken to prevent tyre damage when removing tyre from wheel halves. WARNING:            Serious injury can result from attempting to separate wheel halves with tyre and tube inflated. Remove nuts and washers. Remove thru bolts and washers. Separate and remove wheel halves and brake rotating disc from tyre and tube. Remove retaining rings grease seal retaining rings, grease seal felts, grease seal retainers and bearing cones. NOTE:            Bearing cups are a press fit in wheel halves and should not be removed unles a new part is to be installed. To remove bearing cups, heat wheel in boiling water for 30mins or in an oven not to exceed 121°c (250°F) using an arbor press, if available press out bearing cup and press in new bearing cup while wheel half is still hot. INSPECTION AND REPAIR: Clean all metal parts and felt grease seals in suitable solvent and dry thoroughly. NOTE:            A soft bristle brush may be used to remove hardened grease, dust or dirt. Inspect wheel halves for cracks and damage.

			p. Person
3 4 5 6 7 8 9 10 11 12 III 1 2 3 4	Inspect bearing cones, cups, retaining rings, grease seal retaining rings, grease seal felts and grease seal retainers for wear or damage. Inspect thru bolts and nuts for cracks in threads or cracks in radius under bolt head. Replace cracked or damaged wheel half. Inspect tyre for side wall cracking, uneven wear and other damages. Record tyre si.no                               and mfg date                       Inspect tube for excess creasing and localised thinning/bulging. Check for leads especially around valve stem by inflating the tube and immersing in a water tank. Record  si.no                               and mfg date                       Replace damaged, retainer rings and seals. Replace worn or damaged bearing cups and cones. Replace any corrosion or small nicks. Repair reworked area of wheel by cleaning thoroughly. Then applying one coat of clear lacquer paint. Pack bearings with grease. ASSEMBLY: Assemble bearing cone, grease seal retainer, grease seal felt and retaining ring into each wheel half. Insert tube in tyre, aligning index marks on tyre and tube. NOTE:            The light weight point of the tyre is marked with a red dot on the side tyre wall and heavy weight piont of the tube is amrked with a contrasting colour line (usually near inflation valve stem) when mating tyre with tube these marks adjacent to each other. Replace wheel half into tyre and tube (side opposite valve stem) aligning base of valve stem in valve slot with washer under head of the bolt. Insert bolt through wheel half. Place wheel half into other side of tyre and tube aligning valve stem in valve slot.

  

5 6 7 8 9

Insert washer and nuts on the bolts and pre-torque to 10 to 50 lb.in. CAUTION:            Uneven or improper torque of the nuts can cause failure of the bolts with resultant wheel failure. Prior to torquing nuts, inflate tube with approximately 15-20 p.s.i air pressure to seat tyre. CAUTION:            Do not use impact wrenches on the bolts or nuts. Dry torque all nuts evenly to a torque value of 140 – 150 lb.in. Paint 1” wide creap marks on tyre and rim with red paint. Inflate tyre to correct pressure.