Yanmar 129271-42700 Front Pump Drive Gear for 3JH and 4JH

Basic Info

Warranty Info

Literature

Rebate Info

Video

Brand
Yanmar

Manufacturer
Yanmar Marine

Manufacturer Part Number
129271-42700

Country of Origin
Japan

Special Order
No

Exportable
Yes

HTS Code
8413.91.9096

Truck Freight
No

Quantity In Stock
0

On Order
0

Your Price
$571.13

Qty

Yanmar 129271-42700 Front Pump Drive Gear for 3JH and 4JH

The Yanmar 129271-42700 is the genuine replacement front pump drive gear for 3JH4, 3JH5, 4JH5 and 4JH57 engines.

Inspect the mating gear whenever this one is replaced. Gears wear as a pair, and a new gear running against a worn one takes up the wrong tooth profile from the start.

Key Features

Genuine Yanmar replacement front pump drive gear
Fits 3JH4, 3JH5, 4JH5 and 4JH57 engines
One per pump
Positive gear drive from the engine to the pump
Replaces a gear with worn, chipped or broken teeth
Inspect the mating gear at the same time

Applications

3JH4, 3JH5, 4JH5 and 4JH57 engines
Raw water pump drive repairs
Replacing a gear with a chipped or broken tooth
Curing excessive backlash in the pump drive
Engine rebuild and refit work
Marine diesel service and overhaul

Specifications

Brand: Yanmar
Manufacturer: Yanmar Marine
Manufacturer Part Number: 129271-42700
Part Type: Front Pump Drive Gear
Fits: 3JH4, 3JH5, 4JH5 and 4JH57 engines
Quantity Used: One per pump
Condition: New

Frequently Asked Questions

Q: Should the mating gear be replaced too?
Inspect it carefully. Gears wear as a pair, and a new gear against a worn mate picks up the wrong profile quickly.

Q: What causes a pump drive gear to fail early?
A seized or stiff pump is the usual cause. The gear is driving a load it was never meant to carry, and the teeth take it.

Q: Is backlash adjustable?
It is set by the gear geometry and the housing, not by adjustment. Excess backlash means worn parts rather than something to be taken up.

Q: Does a gear drive need lubrication?
It runs in the engine gear train and shares its lubrication, which is one reason a pump seal failure that lets water into that area is serious.

Not sure this is the right part? Send us a Picture of the Pump Plate on your pump and the CLR Marine team will confirm the correct front pump drive gear.

k 1

CLR Marine is proud to serve the boating community by providing top-quality marine supplies for safety, performance, and adventure on the water.