G-Force Nova GFNM12000 SD12 Shank

Features:

• No foot valve required
• 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	GFN12001
2	Back Head Washer	GFN12002
3	Back Head O-ring	GFN12003
4	Buffering Washer	GFN12004
5	Make-Up Rubber(Buffering)	GFN12005
6	Air Check Valve	GFN12006
7	Air Check Valve Spring	GFN12007
8	Air Guide Plug (Choke)	GFN12008
9	Air Guide	GFN12009
10	Air Guide O-ring	GFN12010
11	Air Distributor	GFN12011
12	Air Distributor O-Ring	GFN12012
13	Cylinder	GFN12013
14	Wear Sleeve	GFN12014
15	Piston	GFNM12015
16	Piston Stop Ring (Buffering)	GFN12016
17	Bearing	GFNM12017
18	Bearing O-Ring	GFNM12018
19	Bearing Stop Ring	GFN12019
20	Bit Retaining	GFNM12020
21	Bit Retaining O-Ring	GFNM12021
22	Guide Sleeve	GFNM12022
23	Chuck Washer	GFN12023
24	Chuck	GFNM12024
-	O-Ring Kit	GFN12025

Specifications

Length (w/o drill bit)	71.5"
Outside Diameter	10.35"
Weight (w/o bit)	1232 lbs.
Cylinder Bore	8.27"
Piston O.D.	8.26"
Piston Stroke	4.5"
Piston Weight	254 lbs.
Hole Sizes	11 7/8" - 17 1/2"
Air Pressure Consumption	100 psi - 350 psi
Wrench Size	A/F 7.95"
Connection	Std. 6 5/8" API Reg Pin

Air Consumption Chart

PSI	100	150	200	250	300	350	400
CFM with blank choke	418	672	974	1,268	1,548	1,756	-

All Hammers come Fitted with blank Choke located in the Air Check Valve

Hammer Service Log

Wear Sleeve / Piston Clearance

Part	New Dimension		Discard Clearance
Wear Sleeve	A	8.27"	greater than or equal to 0.010"
Piston OD	B	8.26"

Inner Cylinder / Piston Clearance

Part	New Dimension		Discard Clearance
Cylinder ID	C	5.98"	greater than or equal to 0.010"
Piston OD	D	5.978"

Distributor Probe / Piston ID Clearance

Part	New Dimension		Discard Clearance
Distributor Probe OD	F	2.47"	greater than or equal to 0.010"
Piston ID	E	2.48"

Bearing - Piston OD Clearance

Part	New Dimension		Discard Clearance
Bearing ID	H	6.10"	greater than or equal to 0.010"
Piston OD	G	6.09"

External Wear

Description	Wear Limit
Wear Sleeve Reverse Dimension	9.88"
Wear Sleeve Discard Dimension	9.72"
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 - 5600 lbs.

Maximum @ 350 psi - 9900 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.