HM Unloader

This General Pump / Interpump HM Unloader is commonly used for pressure washing applications and in conjunction with General or Interpump Pumps.

It permits excess flow to be bypassed to maintain a selected pressure. Designed for use in systems which incorporate a gasoline engine.

Features:

• Trapped Pressure Unloader
• Eliminates back pressure in system when pulling a manual start engine
• Brass body
• Stainless steel valve and seat
• Plastic adjustable pressure control knob
• Built-in easy start valve
• Must be mounted in vertical position
• Operates on single or multiple gun systems
• Optional spring must be used if mounted in any other position

Specifications:

• Max. Flow: 10.8 GPM (41 LPM)
• Max. Discharge Pressure: 3000 PSI (207 BAR)
• Max. Temperature: 165 degrees Fahrenheit (74 degrees Celsius)
• Inlet Port Size: 3/8"-19 BSPP-F (9.5 mm)
• Outlet Port Size: 1/4"-19 BSPP-F (6.5 mm) and 3/8"-19 BSPP-M (9.5 mm)
• Bypass Port Size: Dual 3/8"-19 BSPP-F (9.5 mm)
• Dimensions: 2.75" x 3.75" x 6.50" (70 mm x 95 mm x 165 mm)
• Weight: 2.5 lbs. (1.1 kg)

The General Pump HM Unloader Repair Kit #72 includes:

• 1 x 36.3102.66 Valve Seat
• 1 x 36.3104.51 Valve Guide
• 2 x 90.3575.00 O-Rings
• 1 x 90.3585.00 O-Ring
• 1 x 90.3594.00 O-Ring
• 1 x 90.3822.00 O-Ring
• 1 x 90.3831.00 O-Ring
• 1 x 90.3833.00 O-Ring
• 1 x 90.3843.00 O-Ring
• 1 x 90.3847.00 O-Ring
• 1 x 90.5025.00 Anit-Ext. Ring
• 2 x 90.5080.00 Anit-Ext. Rings
• 1 x 94.7355.00 Spring
• 1 x 94.7374.00 Spring
• 20 x 94.8495.00 Washers
• 2 x 97.4838.00 Balls