Just bought last year so this is my first oil change. My manual says the oil filter is T20646. I can’t find that part number online. The local dealer wants a serial number or they won’t help me. I have tried reading it off the block but can’t make it out. Can anyone help me with a part number and place to order one? Thank you in advance for your help.

A second S/N should be found on rear of transmission case, top left,

933G model runs s/n 42A5918 to 42A9202
Original oil filter part # is 7M3800 = 1R0659 current Cat number or Wix 51161

I've been looking and found the 933"C" 955C, 955E used a Cat 9F6700 p/n for replaceable filter
WIX
Product Specifications
Part Number: 51161
UPC Number: 765809511613
Style: Cartridge Lube Metal Canister Filter
Service: Lube/Hydraulic
Type: Full Flow
Media: Enhanced Cellulose
Height: 9.277 (236)*
Outer Diameter: 3.968 (101)*
Inside Diameter: 1.635 (42)*
Beta Ratio: 2/20=17/33
Max Flow Rate: 18 GPM
Nominal Micron Rating: 32
( )* denotes metric
Gasket Diameters
Number O.D. I.D. Thk.
15449 Packed 4.815 (122)* 4.585 (116)* 0.125 (3)*
15286 Packed 4.79 (122)* 4.63 (118)* 0.125 (3)*
15108 8 4.458 (113)* 4.25 (108)* 0.125 (3)*

Principle Application: Autocar, Bay City Shovel, Caterpillar, Gardner-Denver, Koehring, Komatsu

Old wrote:

933G model runs s/n 42A5918 to 42A9202
Original oil filter part # is 7M3800 = 1R0659 current Cat number or Wix 51161
 

Ya beat me to it OM 😁👍
Quick draw McGraw..😁

Fat Dan: You have to be fast on your feet, OM does not let the moss grow under his hat! Thanks for BOTH of you for assisting the original poster. JM