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Hydraulic pump couplers for Caterpillar excavators, covering a wide range of compact and full-size machines from the 311C through the 336D. These couplers connect the engine to the hydraulic pump and are critical to maintaining proper hydraulic system function — worn or failed couplers lead to pump slippage, vibration, and loss of hydraulic pressure.
Fits Models At A Glance
- 300C Series: 311C, 312C, 313B, 314C
- 300D Series: 311D, 312D, 314D, 314DLCR, 320D, 330D, 336D
Key Notes
- Application: Connects engine flywheel to hydraulic pump drive; critical for pump engagement and pressure output
- Part Numbers: Covers Cat part numbers 099-0149, 7Y1901, 7Y0463, and 3244230
- Fitment Range: Spans compact excavators through large production excavators
- Condition: New replacement couplers available for all listed models
Why Choose Broken Tractor
- ✅ Accurate fitment data matched to Cat model and serial range
- ✅ Fast shipping from Baton Rouge, LA and Kimbolton, OH
- ✅ Dedicated Cat excavator parts specialists ready to assist
Frequently Asked Questions
What are the symptoms of a bad hydraulic pump coupler on a Cat excavator?
The most common signs of a worn or failed pump coupler are pump slippage, vibration, and a loss of hydraulic pressure. The coupler connects the engine flywheel to the hydraulic pump drive, so when it wears out the pump can no longer engage properly and deliver full pressure output. Replacing the coupler restores that connection between the engine and the pump.
What hydraulic pump coupler fits a Cat 320D excavator?
The Cat 320D uses the hydraulic pump coupler under part number 7Y0463. Broken Tractor carries it as a new replacement coupler built to connect the engine flywheel to the hydraulic pump drive. Fitment can vary by serial range, so match the part number from your old coupler or confirm with our parts team before ordering.
Which pump coupler fits the Cat 311C, 312C, 313B and 314C excavators?
Part number 099-0149 is the hydraulic pump coupler for the Cat 311C, 312C, 313B and 314C excavators. We carry it as a new replacement part for these 300C series machines. If you are unsure which coupler your machine uses, compare the part number on your existing coupler before you buy.
Does the Cat 7Y1901 pump coupler fit the 314DLCR?
Yes, the 7Y1901 hydraulic pump coupler fits the Cat 314DLCR as well as the 311D, 312D and 314D excavators. It is a new replacement coupler that links the engine flywheel to the hydraulic pump drive. To confirm fitment for your exact serial number, call (800) 909-7060 and our Cat excavator parts specialists can help.
What hydraulic pump coupler fits a Cat 330D or 336D excavator?
The Cat 330D and 336D excavators both use the hydraulic pump coupler under part number 3244230. Broken Tractor offers it as a new replacement for these larger production excavators, with fast shipping from Baton Rouge, LA and Kimbolton, OH. Match the part number on your current coupler to make sure you are ordering the correct one.
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