Graco Inc 800-639 Servicing the V-Packings, Must be purchased separately, Backflow Preventor

Servicing the V–Packings

NOTE: There are two types of packing kits: one is packings only , the other includes the packings, rings and retainers.

1.Remove the manifold as outlined in the Pumping Section.

2.Carefully pull the packing retainer from the manifold. Examine the o–ring and replace it if it is cut or damaged.

3.Remove the v–packing and head ring. Pull out the intermediate retainer ring. Remove the second v–packing and second head ring.

4.Inspect all parts and replace as necessary.

ACCESSORIES

(Must be purchased separately)

DOWNSTREAM CHEMICAL INJECTOR KIT 800–117

For injecting harsh cleaning chemicals downstream from the pump.

UPSTREAM CHEMICAL INJECTOR KIT 800–257

For injecting mild cleaning chemicals upstream into the pump.

5.Thoroughly clean the packing cavities and examine for debris and damage.

6.Lightly grease the packing cavities and then replace the packings in the following order: head ring, v–packing, intermediate ring, head ring, v–packing and packing retainer with the o–ring installed in the retainer groove.

CAUTION

Install the parts in the proper order and facing the correct direction. Improperly installed parts will cause a malfunction.

7.Reassemble the manifold as instructed in Servicing the Plungers.

ANTI–FREEZE FLUSH KIT 802–327

For flushing system with 50% anti–freeze solution prior to transporting or storing pressure washer in below freezing temperatures.

INLET PRESSURE REGULATOR 800–258

Regulates inlet water pressure to 60 psi (4 bar) maximum.

BACKFLOW PREVENTOR 801–133

Prevent back–up of contaminated water into fresh supply. Install upstream of pump.

TECHNICAL DATA

	Model 800–638	Model 800–690	Model 800–639
Engine (air–cooled, 4 cycle)	9 hp Honda OHV	9 hp Briggs & Stratton OHV	11 hp Honda OHV
Gasoline Tank Capacity	6.2 quarts (6 liters)	5 quarts (4.8 liters)	6.9 quarts (6.5 liters)
Water Pump Maximum Working	2500 psi (172 bar)	2500 psi (172 bar)	3000 psi (207 bar)
Pressure
Water Pump Maximum Flow	4 gpm (15 lpm)	4 gpm (15 lpm)	4 gpm (15 lpm)
Inlet Hose Connection	3/4” garden hose (f)	3/4” garden hose (f)	3/4” garden hose (f)
Weight	158 lb (70 kg)	158 lb (70 kg)	172 lb (78 kg)
Dimensions	36” (914 mm)	36” (914 mm)	36” (914 mm)
Length
Width	21” (533 mm)	21” (533 mm)	21” (533 mm)
Height	23.5” (597 mm)	23” (584 mm)	24” (610 mm)
Maximum Inlet Water Temperature	160_￿ F (70_￿ C)	160_￿ F (70_￿ C)	160_￿ F (70_￿ C)
Wetted Parts
High Pressure Hose	Acrylonitrile and Buna–N cover and tube
Bypass Hose	Synthetic yarn and EPDM
Pressure Washer	Anodized aluminum, Aluminum or bronze alloys, Brass Copper, Nylon–PTFEr
(including fittings)	composite, Ceramic, Buna–N, Cotton phenolic, 303, 304, and 316 Stainless steel,
	Polymide–12 thermoplastic,PTFEr, Carbon steel, Zinc with or without yellow
	chromate plate
	PTFE is a registered trademark of the DuPont Company.

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