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SKU:
NLT1G02457
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Caterpillar Locking Hydraulic Tank Cap 142-8937 for D1-D6K2
$34.99
In Stock
$34.99
Sale price
$34.99
Regular price
This new aftermarket locking non-vented hydraulic tank cap replaces Caterpillar 142-8937 for compatible D1, D2, D3, D4, D5K2, and D6K2 track-type tractors.
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Compatible Models
We do our best to list all compatible models. Although this may be the part you need, your exact model may not appear below.
Compatible equipment / model
- Caterpillar D1, D2, D3, D4
- Caterpillar D3K2 LGP and XL
- Caterpillar D4K2 LGP and XL
- Caterpillar D5K2 LGP and XL
- Caterpillar D6K and D6K2
- Caterpillar D6K2 LGP and XL
Product Overview
A missing cap can let rain, dust, and jobsite grit enter expensive hydraulic oil, while a cracked seal can leave an oily film around the filler neck. This keyed cap restores a closed filler point when the neck and tank are undamaged.
Caterpillar identifies 142-8937 as a non-vented hydraulic tank cap. It is not a fuel cap, radiator cap, or substitute for a vented design, and installing the wrong cap can affect system operation.
Match 142-8937, filler-neck threads, seal diameter, lock style, tank label, and machine serial number. Do not identify the tank by location alone.
Key Features & Performance
- Locking cap helps discourage casual contamination or removal
- Non-vented configuration for specified hydraulic tanks
- Sealing surface protects fluid from dirt and water
- Direct replacement when neck and reference match
Replaces Part Numbers
- 142-8937
- 1428937
Common Uses
- Replacing a lost hydraulic filler cap
- Stopping seepage caused by a damaged cap seal
- Securing the hydraulic tank on unattended equipment
Technical Specifications
- Product Type: Locking non-vented hydraulic tank cap
- System: Hydraulic reservoir
- Primary Reference: 142-8937
- Condition: New aftermarket replacement
Installation & Fitment
- Clean the filler neck before removing the old cap
- Confirm the tank is not pressurized
- Compare thread, seal, and vent configuration
- Install without cross-threading
- Check the reservoir vent system and inspect for seepage
Compatibility Notice
Northline Parts does its best to list all known compatible models, but the correct part may fit an application that is not shown above. Model year, production date, serial number, engine or equipment specification, installed options, and previous repairs can change fitment. Match the original part, reference number, dimensions, connectors, mounting points, and product photos before purchase.
Frequently Asked Questions
Q: Is this a fuel tank cap? A: No. Caterpillar lists 142-8937 as a locking non-vented cap used on hydraulic tanks.
Q: Why does vented versus non-vented matter? A: The reservoir ventilation system is designed around a specific cap type. Match the original.
Q: Will it fit every D4? A: No. Machine configuration, serial number, filler neck, and original cap reference must match.
Q: Is this an original-equipment part? A: No. This is a new aftermarket product. Brand names and part numbers are used only to identify compatible applications.
Part Summary
keywords: Caterpillar 142-8937 hydraulic cap, D3K2 locking tank cap, D4K2 hydraulic filler cap, D6K2 reservoir cap replacement, Cat dozer missing hydraulic cap
Brand names, model numbers, and reference part numbers are used for identification and compatibility purposes only. Verify the original component, specifications, and application before purchase.