Model # 1538-1 Official Generac pressure washer

Here are the diagrams and repair parts for Official Generac 1538-1 pressure washer, as well as links to manuals and error code tables, if available.

There are a couple of ways to find the part or diagram you need:

Click a diagram to see the parts shown on that diagram.
In the search box below, enter all or part of the part number or the part’s name.

Not all parts are shown on the diagrams—those parts are labeled NI, for “not illustrated”.

We encourage you to save the model to your profile, so it’s easy to access parts and manuals for your appliance whenever you log in.

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

Owner’s manual

Model diagram and schematic

SEARCH WITHIN THIS MODEL

ALL PARTS

Showing 10 of 67 parts |

#31

Unit diagram

Kit

Part #188287

Replaced by #705001

$26.04 |

19% OFF Phone Price : $32.04

In Stock

Qty

#22

Unit diagram

O-ring kit

Part #B5830

Replaced by #705001

$26.04 |

19% OFF Phone Price : $32.04

In Stock

Qty

#29

Unit diagram

Extension wand

Part #B3858

Replaced by #706595

$50.80 |

11% OFF Phone Price : $56.80

In Stock

Qty

#14

Unit diagram

Tire, 3" x 10"

Part #B4966

Replaced by #209636GS

$85.96 |

7% OFF Phone Price : $91.96

In Stock

Qty

#35

Unit diagram

Filter

Part #A1041

Replaced by #709496

This item is not returnable

$11.69 |

15% OFF Phone Price : $13.69

In Stock

Qty

#41

Unit diagram

Connector

Part #21424

Replaced by #21424GS

This item is not returnable

$21.09 |

22% OFF Phone Price : $27.09

In Stock

Qty

#19

Unit diagram

Vibration mount

Part #27007

Replaced by #191413GS

This item is not returnable

$11.60

In Stock

Qty

#36

Unit diagram

Nut

Part #67989

Replaced by #67989GS

This item is not returnable

$5.80

In Stock

Qty

#34

Unit diagram

Hose

Part #A1040D

Replaced by #705076

This item is not returnable

$21.89 |

22% OFF Phone Price : $27.89

In Stock

Qty

Pump diagram

Screw

Part #B2261B

Replaced by #B2261BGS

This item is not returnable

$7.14

In Stock

Qty

Symptoms for gas pressure washers

Choose a symptom to see related pressure washer repairs.

View all

Why does my pressure washer spray too hard?

Main causes: faulty unloader valve, bad pressure regulator…

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…

Why does my pressure washer's engine lose power?

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

Why won't the pressure washer starter rope retract?

Main causes: broken recoil spring, damaged recoil starter…

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…

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…

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…

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…

Why doesn't my pressure washer recoil starter work?

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

Repair guides for gas pressure washers

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

View all

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…

Repair difficulty

Time required

15 minutes or less

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…

Repair difficulty

Time required

45 minutes or less

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…

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.

View all

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.…

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…

Top questions about Sears and Sears PartsDirect

Model # 1538-1 Official Generac pressure washer

Model diagram and schematic

SEARCH WITHIN THIS MODEL

Symptoms for gas pressure washers

Why does my pressure washer spray too hard?

Why won't my pressure washer engine start?

Why does my pressure washer's engine lose power?

Why won't the pressure washer starter rope retract?

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

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

Why is the spray from my pressure washer weak?

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

Why doesn't my pressure washer recoil starter work?

Repair guides for gas pressure washers

How to install a pressure washer chemical injection kit

How to install a pressure washer O-ring kit

How to replace a pressure washer pump

Effective articles & videos to help repair your pressure washers

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

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

Top questions about Sears and Sears PartsDirect

Parts & More

Stay Connected

Quick links

Let us help you

More resources