The order we never skip — which is why the wrong part does not reach your site.
01
Confirm
Nameplate, OEM number and working conditions — checked against your machine, confirmed in writing before you pay.
02
Verify
Photos and video of the actual part, packed and labelled, before it leaves. What you see is what ships.
03
Prevent
Send the hour-meter reading and we log the service interval — you get a message before the next one is due.
04
Dispatch
Nothing leaves Xi’an until you reply "ok". You approve, then we ship — not the other way round.
Confirm this part for my machine
Machine model and part number are what let us confirm fitment in writing. Message is optional.
Overview
Fitment Note: Confirmed by the removed shell number and the measured crankpin size. Standard is listed; 0.25 mm and 0.50 mm undersize can be quoted after a crank regrind.
Specifications
MOQ
1 set
Size
Standard (STD)
Type
Connecting Rod Bearing Set
Engine
CAT 3066 / S6K / C6.4
Material
Bimetal (Steel Back / Copper Alloy)
Position
Connecting rod big end
Replaces
CAT 5I-7637
Shipping
Rail / Sea / Air
Warranty
12 Months
Lead Time
15-30 Days
Application
CAT 311 / 311B / 311C / 320B / 320C / 320D
Aftermarket connecting rod bearing set (big-end shells) 5I-7637A1 — a direct replacement for the Caterpillar 5I-7637 rod bearing. It fits the Caterpillar 3066 / S6K / C6.4 diesel engine family (also 3064 / C4.2), commonly used on CAT 311 / 311B / 311C / 320B / 320C / 320D excavators. Standard size.
The rod bearings carry the crankshaft big-end journal of the connecting rod. When they wear, big-end clearance opens up — typical signs are a knocking under load that follows engine speed, low oil pressure, and in severe cases a spun bearing or scored crankpin. They are normally renewed together with the main bearings and thrust washers during an engine overhaul.
Bimetal construction: a steel backing with a copper-alloy (aluminium-tin / lead-bronze type) lining. Supplied as a set for the engine. Confirm the removed shell number, the crankpin size and whether standard or an undersize (0.25 / 0.50 mm) is required before ordering.
Increased big-end clearance, a knock under load that follows engine speed, low oil pressure, metal particles in the oil; severe cases show a spun bearing or scored crankpin.
Installation Tips
1. Check the crankpins for ovality, taper and scoring; regrind if required.
2. Fit the bearing shells to the rod and cap; check the locating tangs and oil holes.
3. Oil the shells, fit the rod and torque the cap bolts to specification.
4. Check the big-end clearance and rotation before final assembly.
