INSERT 1257037 - Caterpillar

PROBLEM
The 9T-6005 HMU Check Valve needs to be replaced on certain 621G and 631G Tractor only machines. The existing 9T-6005 HMU Check Valve can overlap in pressure tolerances with the pressure reducing valve (PRV) and cause steering oil to dump to tank. This could potentially result in eratic steering of the machine.
AFFECTED PRODUCT
Model Identification Number
621G (OEM) MSE00124-00125, 127-128, 131-133, 144
631G (OEM) M1W00102-00109, 111-112
CIPI 0EM02019, 2043
PARTS NEEDED
Qty
Part Number Description
1 3089433 VALVE GP-CHECK E
ACTION REQUIRED
The 9T-6005 HMU Check Valve needs to be replaced with a 308-9433 HMU Check Valve. The HMU pilot pressure needs to be verified that it is within specification. Refer to Testing and Adjusting Manual, RENR5759, for the 621G machines, and RENR5794, for the 631G machines for this procedure. If the pressure is too high, then shims will need to be removed to correct.
OWNER NOTIFICATION
U.S. and Canadian owners will receive the attached Owner Notification.
SERVICE CLAIM ALLOWANCES
Caterpillar Dealer Suggested Customer Suggested
Parts % Labor Hrs% Parts % Labor Hrs% Parts % Labor Hrs%
100% 100% 0% 0% 0% 0%
This is a 1.0-hour job
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.
COPY OF OWNER NOTIFICATION FOR U.S. AND CANADIAN OWNERS
XYZ Corporation
3240 Arrow Drive
Anywhere, YZ 99999
PRIORITY - PRODUCT IMPROVEMENT PROGRAM FOR REPLACING THE HMU CHECK VALVE
MODELS INVOLVED - 621G and 631G Tractor Only Machines
Dear Caterpillar Product Owner:
The 9T-6005 HMU check valve needs to be replaced on the products listed below. The existing 9T-6005 HMU Check Valve can overlap in pressure tolerances with the pressure reducing valve (PRV) and cause steering oil to dump to tank. This could potentially result in eratic steering of the machine. 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 20Apr2007 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 20Apr2007 Service Letter