PRODUCT IMPROVEMENT PROGRAM FOR ADJUSTING THE LINE RELIEF VALVE PRESSURE SETTINGS FOR THE STICK CYLINDER AND BUCKET CYLINDER ON CERTAIN 320C, 320C L, 322C, AND 325C L EXCAVATORS THAT ARE EQUIPPED FOR LONG REACH CONFIGURATION Caterpillar

PRODUCT IMPROVEMENT PROGRAM FOR ADJUSTING THE LINE RELIEF VALVE PRESSURE SETTINGS FOR THE STICK CYLINDER AND BUCKET CYLINDER ON CERTAIN 320C, 320C L, 322C, AND 325C L EXCAVATORS THAT ARE EQUIPPED FOR LONG REACH CONFIGURATION

Usage:

SEBE9478-03

January 27, 2006
(Revised April 2006)
U-41
A-33
D-34
O-35

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*Priority*	PRODUCT IMPROVEMENT PROGRAM FOR ADJUSTING THE LINE RELIEF VALVE PRESSURE SETTINGS FOR THE STICK CYLINDER AND BUCKET CYLINDER ON CERTAIN 320C, 320C L, 322C, AND 325C L EXCAVATORS THAT ARE EQUIPPED FOR LONG REACH CONFIGURATION
5117		PI30904

NOTE: This Program must be administered as soon as possible. When reporting the repair, use "PI30904" as the Part number and "7751" as the Group Number, "56" as the Warranty Claim Description Code and "T" as the SIMS Description Code. Exception: If the repair is done after failure, use "PI30904" as the Part Number, "7751" as the Group Number, "96" as the Warranty Claim Description Code, and "Z" as the SIMS Description Code.

NOTE: The information supplied in this service letter may not be valid after the termination date of this program. Do not perform the work outlined in this Service Letter after the termination date without first contacting your Caterpillar product analyst.

NOTE: This Revised Service Letter replaces the January 27, 2006 (Revised March 2006) Service Letter. Changes have been made to the Rework Procedure.

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COMPLETION DATE	TERMINATION DATE
July 31, 2006	January 31, 2007

PROBLEM

The line relief valve pressure settings for the stick cylinder and bucket cylinder may not have been adjusted correctly during assembly on certain 320C L, 322C L, and 325C L Excavators that are equipped for long reach configuration. If the line relief valve pressure setting is incorrectly adjusted, the stick may crack and fail.

AFFECTED PRODUCT

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Model	Identification Number
***************************Group1**************************
320C	PAB316, 317, 395, 547, 781, 1182, 1298, 1321, 1322, 1337, 1338, 1354, 1355, 1583, 1677, 1678, 1700, 1986, 2005, 2182, 2422, 2423, 2837, 2838, 3191, 3193, 3230, 3231, 3270, 3271, 3301, 3302, 3345, 3346, 3379, 3380, 3397, 3400, 3446, 3501, 3521, 3549, 3550, 3580, 4051, 4074, 4075, 4243
320CL	ANB3087, 3184, 3346, 3483, 3484, 3585, 3723, 3761, 3764, 3765, 3840, 3857, 3858, 3952, 3953
***************************Group2**************************
322C	FED184, 210, 211, 261
***************************Group3**************************
320C	GLA290, 313, 329, 397, 423, 618, 848, 1021, 1070, 1098, 1099, 1201, 1330, 1358, 1375, 1409, 1498, 1555, 1807, 1900, 2043, 2045
320CL	BDE422, 432, 512, 555
***************************Group4**************************
325CL	CRB355, 363, 397, 461, 478, 512, 518, 548, 556, 582, 611, 617, 636, 639, 725, 1240, 1548

PARTS NEEDED

There are no parts needed for this program.

ACTION REQUIRED

See the attached Rework Procedure.

OWNER NOTIFICATION

U.S. and Canadian owners will receive the attached Owner Notification.

SERVICE CLAIM ALLOWANCES

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Caterpillar		Dealer Suggested		Customer Suggested
Parts	Labor Hrs.	Parts	Labor Hrs.	Parts	Labor Hrs.
100%	2.0	0	0	0	0
NOTE: This is a 2.0-hour job. NOTE: U.S. and Canadian Dealers Only - Eligible dealers may enter a Type 2 SIMS Report

PARTS DISPOSITION

Handle the parts in accordance with your Warranty Bulletin on warranty parts handling.

MAKE EVERY EFFORT TO COMPLETE THIS PROGRAM AS SOON AS POSSIBLE.

Attach. (1-Owner Notification)
(2-Rework Procedure)

COPY OF OWNER NOTIFICATION FOR U.S. AND CANADIAN OWNERS

XYZ Corporation
3240 Arrow Drive
Anywhere, YZ 99999

PRIORITY - PRODUCT IMPROVEMENT PROGRAM FOR ADJUSTING THE LINE RELIEF VALVE PRESSURE SETTINGS FOR THE STICK CYLINDER AND BUCKET CYLINDER

MODELS INVOLVED - 320C, 320C L, 322C, AND 325C L EXCAVATORS

Dear Caterpillar Product Owner:

The line relief valve pressure setting for the stick cylinder and bucket cylinder may not have been adjusted correctly during assembly excavators that are equipped for long reach configuration. If the line relief valve pressure setting is incorrectly adjusted, the stick may crack and fail. You will not be charged for the service performed.

Contact your local Caterpillar dealer immediately to schedule this service. The dealer will advise you of the time required to complete this service. Please refer the dealer to their Service Letter dated January 27, 2006 when scheduling this service.

We regret the inconvenience this may cause you, but urge you to have this service performed as soon as possible to prevent unscheduled downtime.

Caterpillar Inc.

Identification #(s)

Attached to January 27, 2006 Service Letter

Rework Procedure

Line Relief Valves

Set the pressure of the line relief valve for the bucket cylinder.

Table 1

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Line Relief Valve Adjustment for the Bucket Cylinder
Group 1, Group 2, Group 3 & Group 4
Bucket Cylinder Extended	19100 ± 1000 kPa (2770 ± 145 psi
Bucket Cylinder Retracted

Set the pressure of the line relief valve for the stick cylinder.

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Line Relief Valve Adjustment for the Boom & Stick Cylinders
Group 1, Group 2, Group 3 & Group 4
Stick Cylinder Extended	20100 ± 1000 kPa (2915 ± 145 psi)

NOTE: Make sure that the line relief is set at the correct specification. Hydraulic hoses or welded structures may fail if the setting is greater than the specification.

NOTE: Check your record to determine if the line relief settings have been checked and readjusted to the above specifications. If so, submit a SIMS ticket to report completion of the letter. No further action is required.

Slow Return Valves(Group 1 and Group 2 Only)

There is a slow return valve in the hydraulic system for the boom cylinder retract. There is a slow return valve in the hydraulic system for the stick cylinder extend. These two valves adjust the travel speed of the boom and stick.

Check valve (S) adjusts the hydraulic system for the stick cylinder extend.
Check valve (T), adjusts the hydraulic system for the boom cylinder retract.

(V) 70mm Spanner Wrench

(X) 50mm Spanner Wrench

In order to adjust the check valve, position spanner wrench (V) at location (U) on the check valve. Position spanner wrench (X) at location (W) on the check valve.

NOTE: The following adjustment procedure requires a tape measure and a stopwatch. Position the machine on flat ground. The temperature of the hydraulic oil should be 55° ± 5°C (131° ± 9°F). Move the engine speed dial to the 10 position.

Boom Cylinder Extended To - (Y) 2.0 m (6.5 ft)

Raise the boom to the maximum height.
Measure the amount of time for the movement from the boom cylinder extended to a height that is 2.0 m (6.5 ft) from the ground. Refer to Table 2 to dertermine the correct time for your machine.

Table 2

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Group 1	3.7 ± 0.3 seconds
Group 2, Group 3, Group 4	4.2 ± 0.3 seconds

Stick Cylinder Extented to Fully retracted

Raise the boom to the maximum height.
Measure the amount of time for the movement from the stick cylinder retracted position to the stick cylinder extended position. Refer to Table 3 to dertermine the correct time for your machine.

Table 3

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