Skip to content

Country

Comet ZWD4035G Pressure Washer Pump – 4.0 GPM 3500 PSI 1" Gas Flange

by Comet
Original price $530.00 - Original price $530.00
Original price
$530.00
$530.00 - $530.00
Current price $530.00

Part Number: ZWD4035G
Category: Pressure Washer Pumps → Triplex Pumps → Gas Pressure Washer Pumps
Type: Comet ZWD4035G Pressure Washer Pump – 4.0 GPM 3500 PSI 1" Gas Flange


The Comet ZWD4035G Pressure Washer Pump (Part #ZWD4035G) is a genuine OEM triplex plunger pump engineered for demanding commercial and industrial pressure washing applications. Manufactured by Comet Pumps, this heavy-duty direct-drive pump delivers 4.0 GPM at 3,500 PSI, providing exceptional cleaning performance for fleet washing, heavy equipment, construction sites, agricultural operations, manufacturing facilities, and other professional cleaning environments.


Key Features & Benefits

  • Genuine Comet OEM triplex pressure washer pump
  • Part Number: ZWD4035G
  • Heavy-duty triplex plunger design
  • Delivers up to 4.0 GPM at 3,500 PSI
  • Designed for gas-powered pressure washers
  • 1-inch hollow shaft for direct engine mounting
  • Operates at 3,400 RPM
  • Compatible with engines up to 10.7 GHP
  • 15 mm ceramic plungers for extended durability
  • 1/2" FPT water inlet
  • 3/8" FPT high-pressure outlet
  • OEM-quality construction for demanding commercial applications

Technical Specifications

Part Number: ZWD4035G

Pump Model: ZWD4035G

Manufacturer: Comet Pumps

Product Type: Triplex Pressure Washer Pump

Maximum Flow Rate: 4.0 GPM

Maximum Pressure: 3,500 PSI

Maximum Pump Speed: 3,400 RPM

Gas Horsepower (GHP): 10.7

Shaft Size: 1" Hollow Shaft

Ceramic Plunger Size: 15 mm

Water Inlet: 1/2" FPT

High-Pressure Outlet: 3/8" FPT

Connection Size: 1/2" Inlet / 3/8" Outlet

Weight: 17 lbs

OEM Replacement: Yes


Compatible Applications

Designed for use with compatible gas-powered pressure washer systems featuring:

  • 1-inch horizontal engine shafts
  • Direct-drive pressure washer systems
  • Engines up to 10.7 GHP
  • Commercial pressure washers
  • Industrial cleaning equipment
  • Fleet washing systems
  • Agricultural equipment cleaning
  • Construction equipment cleaning
  • Equipment replacement and repair projects
  • OEM equipment installations

Always verify shaft size, mounting configuration, engine horsepower, and pressure/flow requirements before ordering.


Function of the Pressure Washer Pump

The ZWD4035G pump helps:

  • Deliver up to 4.0 GPM of water flow
  • Generate operating pressures up to 3,500 PSI
  • Restore pressure washer performance
  • Provide powerful cleaning for commercial and industrial applications
  • Deliver smooth, efficient pump operation
  • Support continuous-duty cleaning performance

Its heavy-duty triplex plunger design provides superior durability, improved efficiency, and longer service life than conventional pump designs.


Common Signs Replacement Is Needed

Replace the pump if you notice:

  • Reduced operating pressure
  • Decreased water flow
  • Water or oil leaks
  • Excessive operating noise
  • Cracked or damaged pump housing
  • Excessive internal wear
  • Loss of cleaning performance
  • Pump failure during operation

Replacing a worn pump restores cleaning performance while minimizing costly equipment downtime.


Installation & Service Notes

  • Shut down the pressure washer and disconnect the spark plug before servicing.
  • Relieve all system pressure.
  • Verify compatibility with the 1-inch shaft, mounting configuration, engine horsepower, and pressure requirements.
  • Install the pump according to the manufacturer's specifications.
  • Connect the 1/2" FPT inlet and 3/8" FPT outlet fittings.
  • Prime the pump with water before startup.
  • Verify proper operation and inspect for leaks after installation.

Important: Never operate the pump without an adequate water supply. Running the pump dry can quickly damage the ceramic plungers, seals, and valves, significantly reducing pump service life.


Maintenance Recommendations

  • Check the pump oil level regularly and service the pump according to Comet maintenance schedules.
  • Inspect ceramic plungers, packings, water seals, valves, and fittings during routine maintenance.
  • Maintain clean, filtered inlet water to minimize internal wear.
  • Flush the pump after use when pumping dirty or corrosive water.
  • Use only genuine OEM Comet replacement parts and approved lubricants to maintain optimum pump performance, reliability, and long service life.

Explore All Products

Shop Now

Compare products

{"one"=>"Select 2 or 3 items to compare", "other"=>"{{ count }} of 3 items selected"}

Select first item to compare

Select second item to compare

Select third item to compare

Compare