Check the three character prefix on your machine data plate: the models below split by prefix
416B: 8ZK, 8SG
416C: 5YN, 1WR, 4ZN, 1XR
416D: BFP, BGJ, BKG, B2D, CXP
420D: BKC, BLN, BMC, FDP, MBH
424B: JRC
424D: BGP, BKR
428B: 7EJ
428C: 2CR, 8RN
428D: BNB, BLL, BNS, BMT
432D: BLD
438B: 3KK
438C: 2DR, 1TR
438D: BPE, BPN
442D: BRG, BRY
Does NOT fit the 430D: Caterpillar does not list 9R-9475 against the 430D, even though the 430D shares most other boom hardware with the 416D and 420D. Measure your old bushing before ordering.
Key Notes:
Part Number: 9R9475 (Caterpillar reference 9R-9475)
Weight: 1.05 lbs
Application: Boom at the boom and dipper cylinder base pin - the bushing that presses into the boom itself where pin 9R-9812 carries the base ends of both the boom cylinder and the dipper cylinder
Location: Backhoe end, in the boom weldment. Not in the cylinder eye - the bushing inside the cylinder eyes at this same pin is 9R-0139, 38 mm long.
Dimensions: 55.32 mm inside diameter, 68.10 mm outside diameter, 50 mm long
Measure Before Ordering: Three Caterpillar bushings share this exact 55.3 mm bore and 68.1 mm outside diameter and differ only in length - 9R-0139 is 38 mm and sits in the cylinder eyes, 9R-0170 is 45 mm and sits at the boom to dipper pivot, and this one is 50 mm. Measure the length of the bushing you are pressing out.
Style/Type: Straight steel sleeve, no grease hole, no cross holes, no grooves
Quantity: Sold individually. The pin passes through two boom bores - count them on your machine.
Interchange Numbers: Works with Caterpillar linkage pin 9R-9812
Serial Number Notes: Confirm the prefix on your machine data plate against the list above. The 430D is not covered.
Material: Steel, low alloy
Condition: Aftermarket replacement part
Shipping Restrictions: Ships within the lower 48 United States only
Common Use Case or Symptoms:
Order this when the boom knocks at the cylinder base pin under load, when the pin has worn a step where it rides in the boom, or when the old bushing measures 50 mm. Both cylinder bases share this pin, so play here shows up as a shudder in the boom and the dipper at the same time.
Why Choose Broken Tractor?
✅ Boom Side Not Cylinder Side: This is the sleeve that presses into the boom casting. The bushings inside the two cylinder eyes on the same pin are 9R-0139 - different part, 12 mm shorter.
✅ Nineteen Machines On One Number: The 424 through the 442D, covering early, B, C and D Series machines on a single part number.
✅ Straight About The 430D: Caterpillar does not list this part for the 430D and neither do we, even though every other boom bushing on our shelf covers it.
$39.00/ea
Shipping calculated at checkout. If any item in your order is temporarily unavailable, we'll contact you to arrange a back-order or refund — whichever you prefer.
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Our in house parts are manufactured following strict quality standards in our warehouse in Ohio. Parts such as hydraulic cylinders, pins, bushings, sheet metal, track adjusters, booms and dipper sticks are all ready to ship same day that they are purchased! With less time to wait for your shipment, you will be able to get back to work as quickly as possible.
Did you accidentally purchase the incorrect part? We offer returns and exchanges here at Broken Tractor. To proceed with a return, please fill out our form, and we will provide you with return authorization and a step by step return process for your convenience. We are more than happy to help you exchange your part for the correct one! fill out our form to make a request here at Return Request Form and we would be pleased to help you.
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