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Craftsman
Water Pump

Model # 3902523 Official Craftsman pump

Here are the diagrams and repair parts for Official Craftsman 3902523 pump, as well as links to manuals and error code tables, if available.

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Model diagram and schematic

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Showing 10 of 27 parts  |
Rotary Seal U9-6
#5

Replacement parts diagram

Rotary seal

Part #U9-6

Replaced by #U109-6B

?
Manufacturer substitution
This part replaces U9-6. Substitute parts can look different from the original.
$106.69 | 
9% OFF Phone Price : $116.69
In Stock
Pump Nozzle N34P-17
#10

Replacement parts diagram

Pump nozzle

Part #N34P-17

$28.33
In Stock
Slinger N69-1
#2

Replacement parts diagram

Slinger

Part #N69-1

Replaced by #17351-0009

?
Manufacturer substitution
This part replaces N69-1. Substitute parts can look different from the original.
This item is not returnable
$8.89 | 
10% OFF Phone Price : $9.89
In Stock
Pump Body Gasket N20-35
#4

Replacement parts diagram

Pump body gasket

Part #N20-35

Replaced by #N20-35C

?
Manufacturer substitution
This part replaces N20-35. Substitute parts can look different from the original.
This item is not returnable
$9.44
In Stock
Pump Diffuser L1-25P
#7

Replacement parts diagram

Pump diffuser

Part #L1-25P

This item is not returnable
$71.80
In Stock
Pump Shaft Seal N20-34
#8

Replacement parts diagram

Pump shaft seal

Part #N20-34

This item is not returnable
$25.69
In Stock
Pump Impeller J105-42P
#6B

Replacement parts diagram

Pump impeller

Part #J105-42P

$125.69 | 
7% OFF Phone Price : $135.69
In Stock
Nozzle N34P-18
#10A

Replacement parts diagram

Nozzle

Part #N34P-18

This item is not returnable
$6.03
In Stock
Seal Plate N3-9
#3

Replacement parts diagram

Seal plate

Part #N3-9

$123.70
In Stock
Impeller J105-40PA
#6A

Replacement parts diagram

Impeller

Part #J105-40PA

$93.77
In Stock

Symptoms for gas pressure washers

Choose a symptom to see related pressure washer repairs.

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Why does my pressure washer spray too hard?

Main causes: faulty unloader valve, bad pressure regulator…

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Why won't my pressure washer engine start?

Main causes: stale fuel, gummed up carburetor, engine needs tune up, throttle and choke controls need adjustment, bad re…

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Why does my pressure washer's engine lose power?

Main causes: dirty air filter, stale fuel, clogged or dirty carburetor, bad unloader valve…

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Why won't the pressure washer starter rope retract?

Main causes: broken recoil spring, damaged recoil starter…

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Why is smoke coming from the pressure washer's exhaust?

Main causes: overfilling engine with oil, improper fuel/air mixture, choke system problems, dirty carburetor, engine nee…

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Why does water spray out of my pressure washer's pressure relief valve?

Main causes: pump running for more than 5 minutes when the spray wand isn't being used, faulty pressure relief valve, ba…

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Why is the spray from my pressure washer weak?

Main causes: insufficient water supply, clogged water inlet screen, clogged pressure hose, faulty pump check valves, stu…

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Why won't my pressure washer mix in the detergent?

Main causes: using a high-pressure spray tip when applying detergent, clogged siphon tube, chemical injection system fai…

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Why doesn't my pressure washer recoil starter work?

Main causes: damaged recoil starter, oil inside cylinder, locked up engine piston…

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Repair guides for gas pressure washers

These step-by-step repair guides will help you safely fix what’s broken on your pressure washer.

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How to install a pressure washer chemical injection kit

How to install a pressure washer chemical injection kit

The chemical injection valve draws detergent into the pump. If it’s not drawing detergent, use a repair kit to replace t…

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Repair difficulty
Time required
 15 minutes or less
How to install a pressure washer O-ring kit

How to install a pressure washer O-ring kit

O-rings seal fittings on the pressure washer pump. Damaged seals allow water to leak from the pump. Follow these steps t…

Read more
Repair difficulty
Time required
 45 minutes or less
How to replace a pressure washer pump

How to replace a pressure washer pump

The pump can be damaged by air in the inlet water supply or by chemicals that remain in the pump body after using the ch…

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Repair difficulty
Time required
 15 minutes or less

Articles and videos for gas pressure washers

Use the advice and tips in these articles and videos to get the most out of your pressure washer.

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How to enjoy all the online benefits we offer on our Sears PartsDirect website

How to enjoy all the online benefits we offer on our Sears PartsDirect website

Learn about all the convenient features on our Sears PartsDirect website that make your parts purchases easier.…

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Tapping into a new feature in the Search Bar on Sears PartsDirect

Tapping into a new feature in the Search Bar on Sears PartsDirect

Learn about a new feature added to the Search Bar on Sears PartsDirect…

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7 steps for winterizing and storing a pressure washer

7 steps for winterizing and storing a pressure washer

Follow this advice to winterize your pressure washer.…

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