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Rammers

R422 & R442 Series

R422 & R442 Series

R422 Rammer Series

The R422 & R442 Series Rammers are ideally suited for the compaction of granular, mixed and cohesive soils in confined areas. A mainstay in contractor and municipal fleets, the R422 & R442 offer highly productive percussion rammers at less than 141 or 147 lbs. respectively. The contoured fuel tank provides the largest fuel capacity in its class and effectively baffles engine noise. Power is supplied by Honda engines. Model R442 delivers approximately 25% more compaction force and is recommended for heavy clay soils.

  • 4-cycle engine
  • Elevated bellows placement for trench applications
  • Polyethylene slide bearings provide minimal internal wear
  • 11" high density ductile cast iron tamping shoe
  • R422 is available with a conventional (HC) or low-vibration (HL) handle. R442 is only available with a low-vibration (HL) handle
  • 4" and 6" trench shoes available for the R422
4" and 6" trench shoes available
5 Year Warranty
SPECIFICATIONS R422HL R422HC R442H
Shoe Size 11 x 13 in
(28 x 33 cm)		 11 x 13 in
(28 x 33 cm)		 11 x 13 in
(28 x 33 cm)
Operating Weight 141 lb
(64 kg)		 135 lb
(61 kg)		 147 lb
(67 kg)
Engine Option Honda GX100
6.0 cu in (98 cm3)		 Honda GX100
6.0 cu in (98 cm3)		 Honda GX100
6.0 cu in (98 cm3)
Travel Speed Up to 55 ft/min
(16 m/min)		 Up to 55 ft/min
(16 m/min)		 Up to 55 ft/min
(16 m/min)
Compaction Depth* Up to 18 in
(45 cm)		 Up to 18 in
(45 cm)		 Up to 18 in
(45 cm)
Compaction Force** N/A N/A N/A

* Clean sand, optimum moisture. MBW recommends that lifts not exceed 12" of granular soil, 9" of cohesive soil.

** No longer published. See "Beware of Compaction Specifications".

Percussion rate of up to 750 blow/min; Fuel capacity of 4.6 qt (4.3 l); Engine 3600 rpm

() Metric Measurements. Specifications subject to change without notice.