Is 1687800 compatible with Caterpillar C18, 3512, 3516?

Yes. 1687800 is a direct replacement part designed for Caterpillar C18, 3512, 3516 machines. Please verify your machine serial number before ordering.

What is the price of Caterpillar 1687800?

The current price of 1687800 at WSTPARTS is 1.82 USD per unit. Contact our sales team for wholesale or volume pricing.

Is 1687800 an original OEM part or aftermarket?

WSTPARTS supplies genuine OEM Caterpillar parts as well as high-quality aftermarket alternatives. Check the product page or contact us to confirm availability of original parts.

What is the shipping time for 1687800?

In-stock parts are dispatched within 24 hours. Delivery to most destinations takes 3-10 business days depending on the shipping method selected.

Does 1687800 come with a warranty?

All parts sold by WSTPARTS are covered by our quality guarantee. Any defective part will be replaced or refunded according to our warranty policy.

Where is 1687800 installed on a Caterpillar 3512?

Refer to the CAT parts diagram on this page (the "Technical Resources & Diagram" tab). It shows the exact mounting position and exploded structure of 1687800. 1687800 belongs to the AIR INLET AND EXHAUST SYSTEM system.

What equipment does 1687800 fit?

CAT 1687800 LOCKNUT fits 3 Caterpillar equipment models including 3512, 3516, C18, verified against Caterpillar parts manuals and confirmed orders.

Where is 1687800 listed in the Caterpillar parts manual?

1687800 is listed in the Caterpillar parts manual under 3512, AIR INLET AND EXHAUST SYSTEM, group 168-7800, page 558.

How can I order 1687800?

Add 1687800 to the inquiry cart, or send us your machine model and serial number — we verify the part number before dispatch.

CAT 1687800 LOCKNUT for C18 Caterpillar Part

1687800 LOCKNUT is a Bolt/Nut component engineered for Caterpillar C18, 3512 and 3516 machines, built to match original factory specifications. It is categorized under Bolt/Nut. Every unit is fitment-verified before dispatch. Manual reference: 3512: AIR INLET AND EXHAUST SYSTEM, group 168-7800, page 558; 3516: AIR INLET AND EXHAUST SYSTEM, group 167-1762, page 333.

1687800 LOCKNUT for Caterpillar C18 — Genuine & OEM Replacement Part

WSTPARTS supplies genuine and high-quality OEM replacement LOCKNUT (Part # 1687800). Designed for CAT C18, 3512, 3516 equipment.

Compatible Models

Key Features

✔ 100% compatible with CAT C18, 3512, 3516
✔ Meets Caterpillar original quality and performance standards
✔ Genuine CAT parts with anti-counterfeit label | OEM alternatives with warranty
✔ Available for order, contact for lead time

Specifications

Part Number (MPN)	1687800
Product Name	LOCKNUT
Brand	CAT
Applicable Models	C18, 3512, 3516
Weight	0.05 kg
Condition	New (Genuine / OEM Equivalent)
Warranty	12 Months

Where This Part Fits

Every row below is a real listing of 1687800 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
3512	AIR INLET AND EXHAUST SYSTEM	168-7800	p.558
3516	AIR INLET AND EXHAUST SYSTEM	167-1762	p.333
C18	AIR INLET AND EXHAUST SYSTEM	252-8017	p.424
3512	AIR INLET AND EXHAUST SYSTEM	121-5736	p.577
C18	AIR INLET AND EXHAUST SYSTEM	252-8017	p.426
3512	AIR INLET AND EXHAUST SYSTEM	120-9188	p.579
3512	AIR INLET AND EXHAUST SYSTEM	118-9492	p.582
3512	AIR INLET AND EXHAUST SYSTEM	120-8197	p.583

System Notes — AIR INLET AND EXHAUST SYSTEM

The air inlet and exhaust system covers the air cleaner housing and elements, intake piping, turbocharger, aftercooler, exhaust manifold, turbo mounting hardware and gaskets. It delivers clean, dense air and carries hot gas away. On this group, the two dominant failures are dust ingress and heat cycling: a leaking intake joint lets unfiltered air straight into the cylinders and dusts the rings in a few hundred hours, while exhaust manifold and turbo flange gaskets crack from repeated heat cycles and start whistling or sooting. Parts are replaced when boost drops, the intake tract shows dust trails past the filter, or a soot streak appears at a joint.

FAQ

Is 1687800 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 C18.

Genuine vs OEM replacement — what is the difference?
Genuine CAT parts carry an anti-counterfeit label. OEM equivalents are built to the same specifications, bench-tested and supplied with full warranty at a better price.

Stock, shipping and warranty?
Lead time confirmed on request; we quote the fastest available option. Every order is covered by a 12-month warranty.

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