Service, Regulator Disassembly | Graco 203831, 204500, 204501

Service

Regulator Disassembly

Shut off pump, close shutoff valve and relieve pressure in regulator by triggering the spray gun. Remove the regulator from the system.

1.Using the hex end of key (25), adjust screw (20) all the way counterclockwise to relieve regulator spring tension.

2.Remove outlet bushing (15) and counter-balance spring (29) (Model 204500 only) from the body.

3.Unscrew valve stem (27) from diaphragm hanger (28) with adjusting key. See Fig. 3.

4.Remove screws (1), regulator cap (17), spring adjusting screw (20), spring (13), and spring cap (30) (Model 204500 only).

5.Lift diaphragm (31) and hanger from body. Disas- semble the hanger and diaphragm only if dam- aged.

6.Unscrew valve seat (26) from body with a 9/16” socket wrench. See Fig. 3.

7.Thoroughly inspect all parts and inspect for wear or damage, replacing as necessary.

CAUTION

Use special care in handling the valve stem and seat to avoid damaging the hard carbide parts.

Regulator Reassembly

Reassemble regulator in reverse order of Disassem- bly. When inserting the diaphragm and hanger, be sure that all surfaces are clean and smooth. Any dirt or roughness could damage the diaphragm.

Note: Hold hanger (28) and valve stem (27) in place with a finger so that the valve stem is correctly lined up with the valve seat (26).

The hanger should be in line with one set of holes and the nut should be torqued to 20 ft-lb (27 NSm). Turn the valve stem snugly against the seat and then back off 1/2 turn on model 204500 and 3/4 turn on other mod- els to set valve clearance. When installing the

cap (17), line up finger of spring adjusting nut (12) with the groove in the cap (17) . Torque the six screws (1) evenly to 120–130 in-lb (13.6–14.7 NSm) three times consecutively, in the order shown in the TOP VIEW, to compensate for diaphragm relaxation. See Fig. 3.

Note: If further service is needed, see notes on lu- brication, thread sealant, and torque values in Fig. 4.

8306563

1See TOP VIEW for tightening sequence.

2Lubricate with oil.

3Lubricate with grease.

4Torque to 20 ft-lb (27 NSm).

5	Hanger must be parallel	10	4
	to diaphragm holes.

6Torque to 120–130 in-lb (13.6–14.7 NSm).

03371

28 5

			20	3
6	1	1	12
			12

13 3 32 30

31 2

29	03372
	5
3	2

Gauge

1	4
	03370
TOP VIEW	6

Fig. 3

204500, 204501, 203831 specifications

Graco is renowned for its expertise in manufacturing reliable and innovative products for various applications, particularly in the fields of paint sprayers and fluid management systems. Three notable products that stand out in their lineup are the Graco 203831, 204501, and 204500. Each model has unique features and characteristics that cater to different user needs and preferences.

The Graco 203831 is specifically designed for users who require a robust and portable sprayer capable of handling multiple painting surfaces. This model features the ProSpray technology, which ensures a fine finish with minimal overspray, making it perfect for detailed work. The 203831 is equipped with a powerful electric motor that delivers consistent pressure, enabling faster and more efficient painting. Its lightweight design enhances mobility, promoting ease of use for both professionals and DIY enthusiasts. Additionally, this model includes adjustable pressure settings, allowing users to tailor the paint flow to suit different materials and project requirements.

In contrast, the Graco 204501 focuses on enhanced productivity and versatility. This airless sprayer is ideal for larger projects where time efficiency is crucial. It features adjustable spray patterns, which enable users to switch from wide to narrow patterns with ease. The 204501 also comes equipped with a high-capacity paint bucket, allowing for extended operation without frequent refills. As with the 203831, it employs advanced ProConnect technology that facilitates easy repairs and maintenance, ensuring that users can quickly get back to work with minimal downtime.

Finally, the Graco 204500 is a powerhouse meant for industrial applications. This model boasts an impressive flow rate, allowing it to tackle heavy-duty tasks with ease. Its robust build and durability make it suitable for continuous use in demanding environments. The 204500 incorporates cutting-edge FastRx technology, which aids in quick material priming and recovery, thereby reducing material waste. Additionally, this unit allows for remote control operation, providing greater flexibility and convenience during use.

In summary, Graco's 203831, 204501, and 204500 represent a fusion of technological innovation and user-centric features. Each model caters to specific needs, whether it’s portability, versatility for larger jobs, or industrial strength. With Graco, users can expect reliable performance and exceptional finish quality in their painting endeavors.