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American Pneumatic Tools
Authorized Distributor

We distribute quality APT Air Tools: Paving Breakers, Rock Drills, Backfill Tampers, Chipping Hammers and other tools for the construction and mining industries.

MH55 & MH55A Hydraulic Paving Breaker

APT Hammers and Breakers combine flexibility with hard-hitting power. The MH11 pick hammer is designed for horizontal work in renovation, demolition, and structural alterations, while the MH 55 (medium-weight) and MH 70 (heavy-duty) multipurpose breakers are ideal for road building and maintenance on asphalt, brickwork, frozen soil, or concrete.

Features:

  • Slim design for excellent line of sight to the working tool
  • Quick-release couplings for fast connections
  • No external side bolts or protruding parts
  • High-back pressure (HBP) models can be operated from the PTO outlet of most skid steers
  • Vibration-reduced (A) models offer the same breaking performance with additional operator comfort
Specifications
1801354788 MH55 Breaker CALL
Chuck Size (In) 1 x 4-1/4
Weight (lb) 50
Length (in) 27
Oil Flow (gpm) 5-8
High Back Presssure YES
Working Pressure (psi) 1668-1885
Return Line Back Pressure (psi) 508
Impact Rate (5 gpm) (bpm) 1500
Impact Rate (8 gpm) (bpm) 2100
Vibration Level 3 Axes (ISO28927/3) 17.4
Sound Power Level Guaranteed (dB(A)) 107
HTMA Class C/D
Specifications
1801354789 MH55 Breaker CALL
Chuck Size (In) 1-1/8 x 6
Weight (lb) 50
Length (in) 27
Oil Flow (gpm) 5-8
High Back Presssure YES
Working Pressure (psi) 1668-1885
Return Line Back Pressure (psi) 508
Impact Rate (5 gpm) (bpm) 1500
Impact Rate (8 gpm) (bpm) 2100
Vibration Level 3 Axes (ISO28927/3) 17.4
Sound Power Level Guaranteed (dB(A)) 107
HTMA Class C/D
Specifications
1801354778 MH55 Breaker CALL
Chuck Size (In) 1-1/4 x 6
Weight (lb) 50
Length (in) 27
Oil Flow (gpm) 5-8
High Back Presssure YES
Working Pressure (psi) 1668-1885
Return Line Back Pressure (psi) 508
Impact Rate (5 gpm) (bpm) 1500
Impact Rate (8 gpm) (bpm) 2100
Vibration Level 3 Axes (ISO28927/3) 17.4
Sound Power Level Guaranteed (dB(A)) 107
HTMA Class C/D
Specifications
1801354790 MH55A Breaker CALL
Chuck Size (In) 1 x 4-1/4
Weight (lb) 62
Length (in) 27
Oil Flow (gpm) 5-8
High Back Presssure YES
Working Pressure (psi) 1668-1885
Return Line Back Pressure (psi) 508
Impact Rate (5 gpm) (bpm) 1450
Impact Rate (8 gpm) (bpm) 2100
Vibration Level 3 Axes (ISO28927/3) 5.2
Sound Power Level Guaranteed (dB(A)) 107
HTMA Class C/D
Specifications
1801354791 MH55A Breaker CALL
Chuck Size (In) 1-1/8 x 6
Weight (lb) 62
Length (in) 27
Oil Flow (gpm) 5-8
High Back Presssure YES
Working Pressure (psi) 1668-1885
Return Line Back Pressure (psi) 508
Impact Rate (5 gpm) (bpm) 1450
Impact Rate (8 gpm) (bpm) 2100
Vibration Level 3 Axes (ISO28927/3) 5.2
Sound Power Level Guaranteed (dB(A)) 107
HTMA Class C/D
Specifications
1801354779 MH55A Breaker CALL
Chuck Size (In) 1-1/4 x 6
Weight (lb) 62
Length (in) 27
Oil Flow (gpm) 5-8
High Back Presssure YES
Working Pressure (psi) 1668-1885
Return Line Back Pressure (psi) 508
Impact Rate (5 gpm) (bpm) 1450
Impact Rate (8 gpm) (bpm) 2100
Vibration Level 3 Axes (ISO28927/3) 5.2
Sound Power Level Guaranteed (dB(A)) 107
HTMA Class C/D

** At delivery MH55/MH55A are supplied factory set to 8gpm (EHTMA D).  There is a plastic bag in package with a label and restrictor nipple that should be mounted on the tank line (T) if there is a need for the breaker to be set to 5 gpm.  The size of the orifice is tamped on the the nipple.

Consumable Tools
Paving Breaker Tools 
Post Driver Tools
Documentation
Spare Parts List
Safety & Operations Manual
Power Pack Bio Oil Safety & Data Sheet
Part No.DescriptionPrice
Common Replaceable Parts
1807011038 APP13 Hyd Power Pack CALL
1801163321 Oil Flow Divider - OFD5 $705.00
1807016052 APP18 Hyd Power Pack CALL
1801164319 Oil Flow Divider - OFD8 $955.00
1807016054 APP18 Twin Hyd Power Pack CALL
AC-3371801087 Twin Extension Hose - 23' $442.00
3371807751 Power Pack Bio Oil - 1 Gal $96.93
AC-3371801089 Twin Extension Hose - 39' $442.00

HIGH BACK PRESSURE BREAKERS

Now you can use your skid steer, backhoe, excavator, or tractor to power your breaker.  These tools are designed to work with high back pressure and represent a breakthrough in versatility.

These units are able to work on a maximum return/back pressure of 508psi (200 psi for non-high back pressure units)

  • Flow requirement of 8 gpm (Same as non-high back pressure units).
  • Working pressure at approximately 1668 to 1885psi with maximum relief valve setting at 2200 psi. (Same as non-high back pressure units.)
  • To ensure the tool is receiving the correct flow of 8gpm, you will need OFD8 (1801164319).  Max flow in:  32 gpm; Max pressure:  360psi
  • No warranty for tools damaged by over-pressure when run without an oil flow divider.
  • **For John Deere and Bobcat Skidsteer that deliver between 16 and 30gpm - pressure reduction hoses must be used in conjuntion with the OFD