247-8878 Boom Cylinder Seal Kit for Caterpillar Excavators 320B 320C 320D
About the 247-8878 Seal Kit
This aftermarket hydraulic seal kit is listed as part number 247-8878 for the boom cylinder of Caterpillar 320B, 320C and 320D excavators. The 247-88xx series is known in the aftermarket for CAT 320-class boom cylinder seal kits; the exact fitment for your machine and the cylinder dimensions must still be confirmed before ordering.
The “SKF Hydraulic Oil Seal” wording appears in the page title only and is not verified; it is not used as a claim in the new body text.
Verified Specifications
| Specification | Detail |
|---|---|
| Part Number | 247-8878 — as listed on page; 247-88xx family corroborated by third-party listings (CAT 320-class boom cylinder kits) |
| Listed Application | Boom cylinder — as listed, confirm per model |
| Machine Models (listed) | Caterpillar 320B, 320C, 320D, 320D L, 323D, 324D — as listed, confirm per model and serial number |
| Condition | New aftermarket replacement |
Fitment Verification
Send your machine serial number and the measured rod/bore of the boom cylinder to [email protected] before ordering; we confirm the 247-8878 reference and the actual seal brand before dispatch.
Conflict note: 320B, 320C and 320D are different machine generations with different cylinder sizes, and 323D/324D are larger machines — one kit number claimed across all of them must be confirmed against the exact model and cylinder before ordering.
Replacement Scope
The kit covers the sealing elements needed to re-seal the boom cylinder of a CAT 320-class excavator — dynamic rod and piston seals, wipers, wear rings and static O-rings. Exact component types and quantities of the 247-8878 kit are confirmed with the factory before dispatch.
Factory Inspection & Packing
Each 247-8878 kit is inspected against the confirmed reference before packing: seal lips and surfaces are checked, the kit is packed to protect the seals from dust and moisture, and the carton label carries the part number and batch. Inspection photos or a packing list can be provided on request.
Wholesale Ordering
MOQ: 5 kits per part number.
We are a factory-direct supplier of hydraulic cylinder seal kits. The minimum order quantity for this kit is 5 kits per model. For the wholesale price list and lead time, email [email protected] or [email protected] with your quantity and machine models.
FAQ
Q1: Is 247-8878 a genuine Caterpillar part number?
A1: We could not confirm 247-8878 in the official Caterpillar catalog. The 247-88xx family is used by aftermarket suppliers for CAT 320-class boom cylinder kits. Verify fitment with us before placing an order.
Q2: Does this kit fit 320B, 320C and 320D?
A2: The page claims fitment for 320B, 320C, 320D, 320D L, 323D and 324D. Because these are different generations and machine classes, confirm your exact model and cylinder dimensions before ordering.
Q3: Are the seals SKF-branded?
A3: “SKF Hydraulic Oil Seal” appears in the page title only. Confirm the actual seal brand and material with our engineers before ordering.
Q4: What is the wholesale MOQ?
A4: The MOQ is 5 kits per model. Email [email protected] or [email protected] for a factory-direct quote.
Aftermarket replacement part — not manufactured by or affiliated with Caterpillar Inc.. Fitment must be confirmed before ordering.
