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Karcher K 3.97M-Plus (1.423-115.0) Pressure Washer

 Karcher K 3.97M-Plus (1.423-115.0) Pressure Washer Parts

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 Fig # Img Part Name Availability Price
A-1
Cover
Part #: 9.036-808.0
Ships in 8 - 13 business days
 $53.89
Add To Cart
A-3Bolt
Part #: 9.036-737.0
Ships in 8 - 13 business days
 $3.82
Add To Cart
A-4Screw
Part #: 9.086-173.0
In stock
5 available
 $1.23
Add To Cart
A-5Accessories Bracket
Part #: 9.037-038.0
In stock
1 available
 $7.41
Add To Cart
A-6Handle
Part #: 9.036-724.0
Ships in 8 - 13 business days
 $16.55
Add To Cart
A-7Plug
Part #: 9.036-727.0
Ships in 8 - 13 business days
 $1.29
Add To Cart
A-8Turning Knob
Part #: 9.036-738.0
In stock
1 available
 $4.56
Add To Cart
A-10
Cable
Part #: 9.084-087.0
Ships in 8 - 13 business days
 $153.89
Add To Cart
A-10Cable
Part #: 9.084-132.0
In stock
2 available
 $37.59
Add To Cart
A-12Cap-Tank
Part #: 9.048-067.0
Note: Version 1
In stock
2 available
 $5.79
Add To Cart
A-14
Filter
Part #: 9.036-729.0
Note: Version 1
Ships in 8 - 13 business days
 $2.68
Add To Cart
A-15
Moulded Part
Part #: 9.036-722.0
Ships in 8 - 13 business days
 $14.09
Add To Cart
A-16
Cover
Part #: 9.036-730.0
Ships in 8 - 13 business days
 $3.36
Add To Cart
A-17
Cover
Part #: 9.036-711.0
Note: Version 2
Ships in 8 - 13 business days
 $27.25
Add To Cart
A-18
Rm-Tank K3./4.9xmd
Part #: 9.036-893.0
Note: Version 2
Ships in 8 - 13 business days
 $16.66
Add To Cart
Fig #ImgPart NameAvailabilityPrice
B-12Gasket
Part #: 6.362-151.0
In stock
12 available
 $3.99
Add To Cart

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Pressure Washer Parts

Repair Guides
How to Diagnose Pressure Washers

This video explains what pressure washer users need to know to maintain and diagnose pressure washer performance issues.

How to Start a Pressure Washer

Prevent pressure washer performance problems with this video's steps for correct pressure washer setup. Correctly clearing air from your pressure washer also prevents damage.

How to Replace the Spill Valve on a Karcher Pressure Washer

This video will help you fix a common problem with pressure washers: the spill valve. This part is responsible for most of the pressure-related problems you will have with pressure washers.

How to Winterize Power Tools and Machines

This video explains how to properly winterize power tools and machines for winter storage, increasing the life and performance of seasonal tools.

Discussion
Discussion for the Karcher K 3.97M-Plus (1.423-115.0) Pressure Washer

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Electric Karcher K3.97M about 10 yrs old. Used only once or twice per season. Garage stored (never below zero). Flushed clean and ran dry after each use. Problem is when I use the wand with the adjustable pressure (+ and -). (The one you use when using the solvent suction line.) Pump starts with trigger, but only on low pressure, regardless of whether the wand is set to + or -. To get it to kick into high pressure, I must hold the trigger in, then rotate the wand pressure from + to - and then back to +. It then runs at high pressure until I let go of trigger. Next time I pull trigger, I need to do the same thing all over again. This "works", but it is a pain in the rear to do every time I need to let go of the trigger. If I switch to the "rotary" wand (which runs at high p ressure only), everything works works fine. The problem is that that wand cannot be switched to low pressure to use the suction line. My water hose is a dedicated 3/4" ID industrial-grade hose which I use for the Karcher only because I wanted to be sure I always had adequate pressure and flow at the inlet. It has worked perfectly with the same hose for 10 years, until this season. Unloader problems? Is there an easy solution? I have no problems with disassembly & reassembly (I'm a retired professional engineer), but I've never torn apart a pressure washer yet. To save time, I had hoped to get some ideas and suggestions before I tear into it.
963676
Reply: Karcher K3.97M Does Not Strt On ...

963676

It's disappointing to see that these forums are apparently not monitored, since I see no follow-up to this question.

On my K3.97M, the pump stalls when I close the trigger. I can start it again by spinning the fan with it switched off, then switching on again.

On a gasoline-powered pressure washer, I would look at the unloader valve, but I don't see an equivalent part in the parts diagram for this one.

Mark's tear-down video of a similar Karcher Electric model seems clear to follow, but I need to know what parts to order that need replacement.
tudball
Question: K3.97m Short Cycles

tudball

K397m Short Cycles. On, off, on, off. What parts do I need to replace to fix this problem? Thanks!
Do Anderson
Question: No Pressure

Do Anderson

My wand has a leak and it appears to be in the hand held nozzle. Could it be o-rings that are leaking?
Katie
Reply: No Pressure

Katie

Mine just sprung a leak - took it apart and found a hair-line crack in the white plastic part (holds the tiny spring toward nozzle end - other end where water line connects).
David
Question: Karcher Model K3.97M

David

The motor and pump run. The unit does not build pressure and runs all of the time. I cleaned the water intake filter. There are no air leaks and a sufficient water supply. I disassembled and inspected pump head. Still no success.
fancyboxy