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4” GP400 – DHD340

The GP400 is a high performance hammer which can drill under a head of water, typically suited to Waterwell and Geothermal applications due to its non-ported piston design.

It features a choke facility which helps to adjust air flow through the hammer.

At a Glance
Air pressure
Air flow
108mm - 140mm
4 1/4 - 5 1/2
100 - 435 psi
7 - 30 bar
180 - 850 cfm
5097 - 24069 l/min
Hammer Overview
Hammer Model GP400
Part Number 600466
Shank DHD340
Thread Connection API Reg Pin Up 2 3/8"
Minimum Bit Diameter108mm
Hammer Flat Size66mm (2.560")
Weight 40 Kg (122.3 lbs)
Outside Diameter 98mm (3.858")
Length (shoulder to shoulder) 954mm (37.5")
Minimum Weight On Bit250 Kg (550lbs)
Maximum Weight On Bit500 Kg (1100lbs)

Air Consumption

Parts List Maintenance Kits
Type GP400 Service Kit Repair Kit
Shank DHD340
Item Description Part No. SK72 RK123
1Thread Protector200111NoNo
2Top Adaptor602646NoNo
4Choke - Solid604480YesYes
Choke - 1/8"604481YesYes
Choke - 3/16"604482YesYes
5Non Return Valve604444NoYes
6N.R.V Spring760079YesYes
7Make up Shim - 4.9mm602634NoYes
Make up Shim - 5.3mm602635NoYes
Make up Shim - 5.7mm602636NoYes
8Compression Ring604994NoYes
9Air Distributor604992NoNo
13Square Snap Ring604995NoNo
15Snap Ring783029YesYes
16Bit Retaining Ring603255NoYes
Foot Valve601773NoYes

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