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.

 
Air Consumption
AT A GLANCE
SIZE
SHANK
AIR PRESSURE
108mm - 140mm
4 1/4 - 5 1/2
DHD340
100 - 435 psi
7 - 30 bar
500 Kg (1100lbs)
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 Bit
   
Parts List
Type GP400 Maintenance Kits
Shank DHD340 Service Kit Repair Kit
Item Description Part No. SK72 RK123
1Thread Protector200111NoNo
2Top Adaptor602646NoNo
3O-Ring768190YesYes
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
10O-Ring768204YesNo
11Liner604991NoNo
12Cylinder604990NoNo
13Square Snap Ring604995NoNo
14Piston604993NoNo
15Snap Ring783029YesYes
16Bit Retaining Ring603255NoYes
17Chuck603932NoYes
Foot Valve601773NoYes