Axial Clearances of Front Pins Are Now Improved on Certain 320, 320 GCand 323 Excavators {5057, 6501, 6502} Caterpillar

Axial Clearances of Front Pins Are Now Improved on Certain 320, 320 GCand 323 Excavators {5057, 6501, 6502}

Usage:

Excavator: 320 (S/N: YCP1-215; HEX1-11025); 320 GC (S/N: DKJ1-10730; XBJ1-235; KTN1-10244); 323 (S/N: RAZ1-10488)

Reference: Special Instruction , M0099083 , "Rework Procedure for Appropriate Clearance of the Front Pins on Certain 320, 320 GC, and 323 Excavators"

Reference: Special Instruction , M0099625 , "Rework Procedure of Boom Nose on Certain 320, 320 GC, and 323 Excavators"

Description Of Change: Axial clearances of the front pins (PT1-7, PT9, and PT12) are reduced by appropriate application of the shims on the machines listed above. The improved boom assembly suppresses the angled gap at PT4 brackets by adding machining to the inner surface of the PT4 brackets.

Adaptable To: The following changes are adaptable to the products within the listed serial numbers, and are effective with all products after the listed serial numbers.

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Table 1
Required Parts
New Part Number	Part Name	Part Description	Former Part Number ⁽¹⁾
566-0958	Bearing Boom As	Boom As- BRG (GC)	560-1838
566-0952	Boom and Bearing As	Boom As- BRG (STD)	489-0374
566-0955	Boom and Bearing As	Boom As- BRG (HD)	489-0390
564-9028	Pin As	Pin As (PT4)	346-7276 ⁽²⁾
570-4692	Tube As	Tube As (LH bucket line)	513-3068 ⁽²⁾
570-4693	Tube As	Tube As (RH bucket line)	521-4640⁽²⁾
570-4694	Boom Lines Gp	Tube As (LH HP line)	513-3071 ⁽²⁾
570-4698	Boom Lines Gp	Tube As (RH HP line)	521-4624 ⁽²⁾
570-4703	Tube As	Tube As (LH MP line)	513-3082 ⁽²⁾
570-4704	Tube As	Tube As (RH MP line)	521-4629 ⁽²⁾
570-4705	Tube As	Tube As (LH QC line)	538-9696 ⁽²⁾
570-4709	Tube As	Tube As (RH QC line)	521-4630 ⁽²⁾

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⁽¹⁾	The former part number listed is for reference only and may differ.
⁽²⁾	When replacing with the former boom assembly, replace this part number with the updated part number at the same time.

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Illustration 1	g06373299
Boom pin joint locations (A) PT1 (B) PT2 (C) PT3 (D) PT4 (E) PT5 (F) PT6 (G) PT7 (H) PT9 (J) PT8 (K) PT10 (L) PT12

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Illustration 2	g06373300
(M) Former PT4 bracket (N) New PT4 bracket

In the improved boom assembly, spacers are machined and welded on the inner surface of the PT4 bracket. Refer to Illustration 2.

For reducing the axial clearance of the front pins on the existing machines (listed above), refer to Special Instruction , M0099083.

For reducing the angled gap at PT4 brackets on the existing machines (listed above), refer to Special Instruction , M0099625.

If replacing the existing boom assembly with the new part number (566-0958, 566-0952, or 566-0955), replace the other existing parts at the same time. Refer to Table 1.