CAT 9M3786 SEAL O RIN for 345C Caterpillar Part - WSTPARTS

9M3786 SEAL O RIN is a Seal component engineered for Caterpillar 345C, C18 and 3516B machines, built to match original factory specifications. It is categorized under Seal. Every unit is fitment-verified before dispatch. Manual reference: 330C: HYDRAULIC SYSTEM, group 223-7058, page 611; 330D: HYDRAULIC SYSTEM, group 307-5124, page 496.

9M3786 SEAL O RIN for Caterpillar 345C — Genuine CAT & Replacement Part

WSTPARTS supplies genuine CAT and OEM-equivalent direct-replacement SEAL O RIN (Part # 9M3786). Designed for CAT 345C, C18, 3516B, 336D, 3516C, 325C, 325D, 330C, 330D, 3406C, 3406E, 3508C, 3512, 3512C, 3516, 365B, C15, G3508, 345D equipment.

Compatible Models

Key Features

• ✔ 100% compatible with CAT 345C, C18, 3516B, 336D, 3516C, 325C, 325D, 330C, 330D, 3406C, 3406E, 3508C, 3512, 3512C, 3516, 365B, C15, G3508, 345D
• ✔ Meets Caterpillar original quality and performance standards
• ✔ Genuine CAT lines: New Genuine / Cat Reman / Cat Classic | OEM-equivalent direct replacements
• ✔ Available for order, contact for lead time

Specifications

Part Number (MPN)	9M3786
Product Name	SEAL O RIN
Brand	CAT
Applicable Models	345C, C18, 3516B, 336D, 3516C, 325C, 325D, 330C, 330D, 3406C, 3406E, 3508C, 3512, 3512C, 3516, 365B, C15, G3508, 345D
Weight	0.05 kg
Condition	New (Genuine CAT / OEM-equivalent direct replacement)
Warranty	12 Months

Where This Part Fits

Every row below is a real listing of 9M3786 in the Caterpillar parts manual: the machine it is published under, the system it belongs to, the group number and the manual page. Use it to confirm the part against your own parts book before ordering.

Machine	System	Group No.	Manual Page
330C	HYDRAULIC SYSTEM	223-7058	p.611
330D	HYDRAULIC SYSTEM	307-5124	p.496
336D	UNDERCARRIAGE	259-7407	p.462
3406C	COOLING SYSTEM	161-9754	p.536
3406E	COOLING SYSTEM	122-3772	p.270
3508C	COOLING SYSTEM	291-4311	p.196
3512	COOLING SYSTEM	107-5565	p.487
3512C	COOLING SYSTEM	212-8166	p.186

System Notes — HYDRAULIC SYSTEM

The hydraulic system covers the main pump, control valves, cylinders, hydraulic tank, filters, hoses and all the fittings that connect them. It converts engine power into the pressure and flow that drive boom, bucket, steering and travel functions. Hydraulic parts fail mainly through contamination and heat: dirt that passes a worn breather scores pump components, aged hoses crack at the crimp, and O-rings harden and weep under pressure. A part in this group is normally replaced when a function drifts, a cylinder creeps, oil shows up under a machine that used to be dry, or the filter comes out loaded with metal.

System Notes — UNDERCARRIAGE

The undercarriage group covers tracks, shoes, links, bushings, rollers, idlers, sprockets, track tensioners and the recoil hardware. It carries the whole machine weight and transmits drive force to the ground, and it is normally the single largest wear cost on a tracked machine. Wear is a system: a worn sprocket accelerates chain wear, a loose track pounds the bushings, and a seized roller flat-spots the link it runs on. Parts here are replaced on measured wear — bushing diameter, shoe height, roller flange — and replacing one component out of phase with the rest usually shortens the life of both.

FAQ

Is 9M3786 the right part for my machine?
Match the part number on your old part, or send us your equipment serial number — WSTPARTS verifies fitment free of charge for CAT 345C.

Genuine CAT vs direct replacement — what is the difference?
Genuine CAT covers three factory lines: New Genuine, Cat Reman (core exchange with core charge) and Cat Classic (brand-new economy line). OEM-equivalent direct replacements are non-CAT parts; grade and warranty are confirmed in the quotation.

Stock, shipping and warranty?
Lead time confirmed on request; we quote the fastest available option. Every order is covered by a warranty per quotation.

📞 Get a Quote: Contact the WSTPARTS parts team | Email: cat@wstparts.com