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Devilbiss
Gas Pressure Washer

Model # 1603WBF Official Devilbiss power washer

Here are the diagrams and repair parts for Official Devilbiss 1603WBF power washer, as well as links to manuals and error code tables, if available.

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For DIY troubleshooting advice and repair guides, visit our repair help section.

Model diagram and schematic

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ALL PARTS
Showing 10 of 39 parts  |
Devilbiss Knob P726
#402

Pistons & valve seat diagram

Devilbiss knob

Part #P726

The manufacturer no longer makes this part, and there's no substitute part

Devilbiss Seal Kit V160
#1

Pump diagram

Devilbiss seal kit

Part #V160

The manufacturer no longer makes this part, and there's no substitute part

Devilbiss Check Valve 16795
#2

Pump diagram

Devilbiss check valve

Part #16795

The manufacturer no longer makes this part, and there's no substitute part

Injec.ball V152
#477

Pistons & valve seat diagram

Injec.ball

Part #V152

The manufacturer no longer makes this part, and there's no substitute part

Filter F187
#21

Pump diagram

Filter

Part #F187

The manufacturer no longer makes this part, and there's no substitute part

Piston Stem 15488
#412

Pistons & valve seat diagram

Piston stem

Part #15488

The manufacturer no longer makes this part, and there's no substitute part

Seal Case O-ring V153
#18

Pump diagram

Seal case o-ring

Part #V153

The manufacturer no longer makes this part, and there's no substitute part

Seal Retainer V156
#15

Pump diagram

Seal retainer

Part #V156

The manufacturer no longer makes this part, and there's no substitute part

O-ring Kit (contains Key #'s 414-416, 428, 429, 437) V179
#0

Pistons & valve seat diagram

O-ring kit (contains key #'s 414-416, 428, 429, 437)

Part #V179

The manufacturer no longer makes this part, and there's no substitute part

Injector Valve O-ring V151
#476

Pistons & valve seat diagram

Injector valve o-ring

Part #V151

The manufacturer no longer makes this part, and there's no substitute part

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…

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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

Effective articles & videos to help repair your 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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Top questions about Sears and Sears PartsDirect

Top questions about Sears and Sears PartsDirect

Get answers to frequently asked questions about Sears and Sears PartsDirect.…

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