2011/07/28 Caterpillar

Rack Back Bucket Stops Adjustment on 950H through 972H Wheel Loaders {5104, 6001, 6107, 6119}

Usage:

966H A6D

Wheel Loader: 950H (S/N: N1A1-3355,4000-4450; JAD1-1,102-826; M1G1-2344; J5J1-1,143-1197,1501-1695; K5K1-3513,35142-35142,82298-82298) 962H (S/N: N4A1-1286,2000-2133; M3G1-826; J6J1-327,501-529; K6K1-551; MAL1-105,108-112,116-117,121-122,126-127,129-162) 966H (S/N: A6D1-2838; RYF1-524; A6G1-4059,5000-5574; A6J1-1632,1801-1901; TAL1-176,178-423,425-665,669-676) 972H (S/N: GTA1-232,234-249; A7D1-1138; A7G1-1312,2000-2157; A7J1-406,501-506)

Service Magazine, SEPD1299, 08 July 2011, "Rack Back Bucket stops Adjustment on 950H through 972H Wheel Loaders". The information in this article has been updated. Refer to the following information.

ReferenceService Magazine, SEPD0944, "Adjustment Procedure for Bucket Stops on Dealer Installed Buckets or for Reducing Bucket Movement and Material Spillage "

Normal manufacturing tolerances contribute to the occasional gap between the rack back bucket stops and lift arm on 950H through 972H Wheel Loaders equipped with CAT buckets. The tolerance stack up of small variations in pin locations, bucket dimensions, and tilt cylinder extensions all add up. This tolerance stack up creates a gap between bucket and lift arm at some carry positions. The gap may contribute to bucket shaking while the machine is traveling and may generate loss of material in load and carry applications. Contact on one bucket stop should be sufficient to load the lever and lock the bucket as tight as possible. However, contact on both stops is preferable due to bucket twisting.

There has been an increase to the tilt cylinder stroke of 3 mm (0.118 inch) on cylinder groups shown in Table 1. This increase in stroke is to tighten up the tolerance and reduce gap between the rack back stops and lift arms.

Show/hide table

Table 1
Sales Model	Improved Cylinder Gp
950H 962H	356-2217 Tilt Cylinder and Seal
966H 972H	356-2219 Tilt Cylinder and Seal

Refer to the Service Magazine listed above for any necessary adjustments needed.

The improved tilt cylinder and seal are effective with the machines listed in the following table.

Show/hide table

Table 2
950H	(S/N: N1A4451-UP)
	(S/N: JAD827-UP)
	(S/N: M1G2345-UP)
	(S/N: J5J1696-UP)
	(S/N: K5K82300-UP)
962H	(S/N: N4A2134-UP)
	(S/N: K6K552-UP)
	(S/N: M3G827-UP)
	(S/N: MAL163-UP)
	(S/N: J6J530-UP)
966H	(S/N: A6D2839-UP)
	(S/N: A6G5575-UP)
	(S/N: A6J1902-UP)
	(S/N: RYF525-UP)
	(S/N: TAL677-UP)
972H	(S/N: A7D1139-UP)
	(S/N: A7G2158-UP)
	(S/N: A7J507-UP)
	(S/N: GTA250-UP)