2012/11/27 Caterpillar

A Different Rod Assembly and Piston are now used on the Tilt Cylinder Group on Certain 994 Wheel Loaders {5104}

Usage:

994D 3TZ

Wheel Loader: 994 (S/N: 9YF1-UP) 994D (S/N: 3TZ1-UP) 994F (S/N: 4421-UP) 994H (S/N: DWC1-UP)

Service Magazine SEPD1485, 23 August 2012, "A Different Rod Assembly and Piston are now used on the Tilt Cylinder Group on Certain 994 Wheel Loaders". Disregard this article. See the replacement article that follows.

ReferenceDisassembly and Assembly, RENR6321, "Tilt Cylinder Remove and Install"

Description of Change:

ReferenceA different rod assembly and piston are now used on certain 994 Wheel Loaders. The new slip-on type piston will enhance the reliability of tilt cylinder group.

Adaptable To: The tables that follow will explain the new parts and the previous parts for specific arrangements.

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Table 1
994, 994D, 994F, and 994H Standard Lift Arrangement Retaining nut torque 18000 ± 1800 N·m (13276 ± 1328lb ft)
Old part number	Description	New part number	Description
112-3171	Tilt Cylinder Gp	353-3912	Tilt Cylinder Gp
112-3172	Tilt Cylinder Gp	353-3913	Tilt Cylinder Gp
229-9549	Piston	341-6031	Piston
230-0973	Rod As	353-3911	Rod As
3G-5022	Locknut	3G-5022	Locknut

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Table 2
994, 994D, 994F, and 994H High Lift Arrangement Retaining nut torque 18000 ± 1800 N·m (13276 ± 1328lb ft)
Old part number	Description	New part number	Description
219-6272	Tilt Cylinder Gp	341-6033	Tilt Cylinder Gp
219-6273	Tilt Cylinder Gp	341-6034	Tilt Cylinder Gp
229-9549	Piston	341-6031	Piston
219-6274	Rod As	341-6030	Rod As
3G-5022	Locknut	3G-5022	Locknut

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Table 3
994F, and 994H Super High Lift arrangement Retaining nut torque 18000 ± 1800 N·m (13276 ± 1328 lb ft)
Old part number	Description	New part number	Description
247-4566	Tilt Cylinder Gp	353-4653	Tilt Cylinder Gp
251-2005	Tilt Cylinder Gp	353-4654	Tilt Cylinder Gp
248-5430	Piston	353-4651	Piston
219-6274	Rod As	347-3174	Rod As
3G-5022	Locknut	3G-5022	Locknut

The effectivity for this change is shown in Table 4

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Table 4
Effectivity ⁽¹⁾
Model	Adaptable to Machines	Effective with Machines
994	S/N:9YF1-5002	S/N:9YF5003-UP
994D	S/N:3TZ1-380	S/N:3TZ381-UP
994F	S/N:4421-334	S/N:442335-UP
994H	S/N:DWC1-279	S/N:DWC280-UP

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^( 1 )

Only applies to machines equipped with Standard Lift, High Lift, and Super High Lift Arrangements

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Table 5
994F, and 994H Extended High Lift Arrangement Retaining nut torque 18000 ± 900 N·m (13276 ± 664 lb ft)
Old part number	Description	New part number	Description
		322-3141	Tilt Cylinder Gp
		322-3142	Tilt Cylinder Gp
		341-6031	Piston
		347-3174	Rod As
		3G-5022	Locknut