GRACO 25N678 – G-FORCE II 4040 HC-DD Pressure Washer, 4000 PSI, 4 GPM w/ Honda Engine & CAT Pump

GRACO 25N678 – G-FORCE II 4040 HC-DD Pressure Washer, 4000 PSI, 4 GPM w/ Honda Engine & CAT Pump

Ideal for large commercial or industrial contractors, the G-Force II 4040 HC-DD pressure washer is Graco’s top-of-the-line direct drive unit. The premium CAT water pump and reliable Honda engine easily handles tough, all-day cleaning and surface preparation jobs.

Honda® Engine

Reliable, powerful & easy-to-start

Oil Alert shuts down engine to prevent damage if oil level drops too low

Thermal sensor prevents pump from overheating in bypass mode

Premium CAT Water Pump

The most reliable pumps in the industry

The most durable, longest-lasting pumps available

2X longer life than other pumps

External Pressure Unloader

Trouble-free, adjustable pressure

Ability to match application requirements

Keeps water cooler and prolongs pump life

EZ Start Pressure Relief For Easier Starting

Allows water bypass pump to eliminate pressure build-up in the system

No need to pull the gun trigger while starting the washer

Standard Graco feature

100% Heavy-Gauge Aluminum Frames

Up to 40% lighter than steel frames

Corrosion resistant to water and chemicals

Standard on all Graco models

Lifetime Warranty

Direct Drive

Compact design with fewer components and lighter weight

Pump is connected directly to the drive shaft of the engine

Pump rpm matches that of the engine (usually around 3500 rpm)

Additional Specifications

Max Working Pressure: 4000 PSI (27.6 MPa, 276 Bar)

Flow Rate: 4.0 GPM

Engine: Honda

Drive System: Direct Drive

Engine Brand	Honda
Engine Model	GX390
Fuel Tank Capacity (L)	6.5
Fuel Tank Capacity (qt)	6.9
Hose Inlet Diameter (cm)	0.9525
Hose Inlet Diameter (in)	3/8
Hose Inlet Diameter (mm)	9.525
Hose Length (cm)	1524
Hose Length (ft)	50
Hose Length (m)	15.2
Hose Length (mm)	15240
Maximum Flow Rate (GPM)	4
Maximum Flow Rate (L/min)	15.14
Maximum Fluid Pressure (bar)	275.8
Maximum Fluid Pressure (kPa)	27580
Maximum Fluid Pressure (psi)	4000
Maximum Operating Temperature (°C)	63
Maximum Operating Temperature (°F)	145
Maximum Working Pressure (bar)	276
Maximum Working Pressure (kPa)	27600
Maximum Working Pressure (psi)	4000
Model	G-Force II
Motor Drive Type	Direct Drive
Pump Brand	CAT
Pump Type	Triplex Plunger
Recommended Weekly Usage (Hours)	30+
Series	4040
Type	Gas Pressure Washer
Weight (kg)	45
Weight (lb)	99
Maximum Working Pressure (MPa)	27.6

Compatible Equipment

G-FORCE II series pressure washers

Direct-Drive pressure washer systems

GX270 engine

AR RSV series pump

CAT or GPPX series pump

Related Parts

25N682, 25N688K

25N679 – G-FORCE II 4040 HG-BD Pressure Washer, 4000 PSI, 4 GPM w/ Honda Engine & GP Pump

25N683 – G-Force II 4040 HG-BD Pressure Washer, CAT Brass Triplex pump, 4000 PSI

25N680 – G-FORCE II 4040 HC-BD Pressure Washer, 4000 PSI, 4 GPM w/ Honda Engine & CAT Pump

25N684, 25N680K

25N634 – G-FORCE II 3325 HA-DD Pressure Washer, 3300 PSI, 2.5 GPM w/ Honda Engine & AR Pump

25N635 – G-FORCE II 3230 HA-DD Pressure Washer, 3200 PSI, 3 GPM w/ Honda Engine & AR Pump

25N636 – G-FORCE II 4240 KA-DD Pressure Washer, 4200 PSI, 4 GPM w/ Kohler Engine & AR Pump

This is a complete pressure washer unit model. Related parts include other 4040 series models with different engine (Honda/Kohler), pump (CAT/GP), and drive system (Direct Drive/Belt Drive) configurations. 25N678 is listed as one of the models covered by this direct-drive parts diagram. This appears to be a complete pressure washer unit model number rather than an individual replacement part. The diagram shows the exploded view of components for this and related models. 25N678 is one of the main models listed in this Direct-Drive parts list. It appears throughout the parts list as a compatible model for various components including engines, pumps, frames, handles, wheels, hoses, nozzles, thermal valves, and labels. There is also a related model 25N678K mentioned.

Reference Manuals

3A6588 (Page 2) Pressure Washers, Operation, Repair, Parts