G-Force GFM4000 SD4 Shank

Features:

• Easy to service
• Special heat-treated alloy piston for long life, Rockwell hardness 60
• Minimum loss of performance when injecting foam or water

Item #	Description	Part #
1	Back Head	G4001
2	Back Head O-Ring	G4002
3	Choke
4	Air Check Valve	G4004
5	Air Check Valve Spring	G4005
6	Make-Up Rubber (Buffering)	G4006
7	Air Guide	G4007
8	Air Distributor	G4008
9	Air Distributor O-Ring	G4009
10	Cylinder	G4010
11	Cylinder Stop Ring	G4011
12	Wear Sleeve	G4012
13	Piston	G4M4013
14	Piston Stop Ring	G4M4014
15	Bit Retaining O-Ring	G4M4015
16	Bit Retaining Ring	G4M4016
17	Chuck (Drive Sub)	G4M4017
	Choke Plug Kit	G4029
	O-Ring Kit	G4030

Specifications

Length (w/o drill bit)	39.76"
Outside Diameter	3.858"
Weight (w/o bit)	82.4 lbs.
Cylinder Bore	3.229"
Piston O.D.	3.224"
Piston Stroke	3.74"
Piston Weight	20.3 lbs.
Hole Sizes	4"- 6"
Air Pressure Consumption	100 psi - 350 psi
Wrench Size	A/F 3.15"
Connection	Std. 2 7/8" API Reg Pin

Air Consumption Chart

PSI	150	200	250	300	350	400
CFM with blank choke	240	340	440	540	-	-
with 1/8" choke	375	595	760	925	1,060	1,205
with 1/4" choke	425	665	845	1,095	1,270	1,350

Hammer Service Log

Wear Sleeve / Piston Clearance

Part	New Dimension		Discard Clearance
Wear Sleeve	A	3.228"	greater than or equal to 0.010"
Piston OD	B	3.224"

Inner Cylinder / Piston Clearance

Part	New Dimension		Discard Clearance
Cylinder ID	C	2.756"	greater than or equal to 0.010"
Piston OD	D	2.752"

Distributor Probe / Piston ID Clearance

Part	New Dimension		Discard Clearance
Distributor Probe OD	F	0.978"	greater than or equal to 0.010"
Piston ID	E	0.984"

External Wear

Description	Wear Limit
Wear Sleeve Discard Dimension	3.425"
NOTE: Chuck should be replaced when wear transfers to wear sleeve.

Lubrication

G-Force Series Hammers are precision-made tools and should be treated as such. Only the highest quality lubrication should be used and a constant flow of oil must be maintained at all times. Recommended lubrication amount 1/3 Pint per 100 cfm per hour.

Recommended Grades of Lubricant

ESSO MATEX CASTROL SHELL MOBILE

AROX EP 150 RDO 302 RD OIL DP 100 AIR TOOL OIL 2 A 320 ALMO NO. 5

Heavy duty oil is recommended for all year-round use, in particular where air supply to the hammer is at high temperature. If lighter grade oil is required due to very low ambient temperatures, amount of oil being used should be increased by 30 percent.

Recommended Pull Down

Minimum @ 100 psi - 500 lbs.

Maximum @ 350 psi - 1800 lbs.

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Missile Warranty will be voided by the following:

Welding on Wear Sleeve.
Heating Case with a Torch.
Gripping Wrenches across Threads.
Hammering on Casing.

READ WARNING LABEL ATTACHED TO HAMMER.