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Folks,
20 MM Antiaircraft Gun Mount, OP 909, 1943, is a Navy service manual for the anti-aircraft gun of choice during the early years of WW II.
In this online version of the manual we have
attempted to keep the flavor of the original layout while taking advantage
of the Web's universal accessibility. Different browsers and fonts will cause
the text to move, but the text will remain roughly where it is in the original
manual. In addition to errors we have attempted to preserve from the original
this text was captured by optical character recognition. This process creates errors that are compounded while encoding for the Web.
Please report any typos, or particularly annoying layout issues with the Mail Feedback Form for correction.
Richard Pekelney
Webmaster
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NOTICE
Please make the following corrections on the pages listed and Plate 1:
| PAGE NO. |
CORRECTION |
| 21 |
Eighth line up from bottom of page-delete sentence-See Section C-C, Plate 1. |
| 22 |
Sixteenth line from top of page-delete sentence-See Plan View, Plate 1. |
| 28 |
Second line from top of page-change (12-Z-313-5) to read (OE-2283). |
| 28 |
Fifth line from top of page-change (OE-2157) to read (OE-2257). |
| 29 |
Operation No. 8, fourth line-change (OW-2137) to read (OE-2137). |
| 31 |
Operation No. 18, first and third lines-change (12-Z-313-5) to read (OE-2283). |
| 36 |
Operation No. 32, sixth line-change (OE-2086) to read (OE-2045). |
| 44 |
Operation No. 24, second line-change oiler (OE-2138) to read plug (299759-5). |
| 45 |
Operation No. 29, first line-after word screws add (367557-8). |
| 45 |
Operation No. 33, first line-change (OE-2158) to read (299948-1). |
| 51 |
Operation No. 1, between lines (c) and (e)-add (d) Place spacing ring (OE-2067) on spring (OE-2062). |
Plate 1
at p. 56 |
Left end of plate, Section A-A-change top (OE-2168) (leading to the spiral spring housing bushing, printed in blue) to read (OE-2166). Center of plate, list of part numbers starting with 299948-1-change (OE-2093) to read (OE-2036); change (OE-2030) to read (OE-2093). Right center of plate, below handwheel, list of parts starting with (OE-2108)-change (OE-2142) to read (OE-2123) and (OE-2123) to read (OE-2142). |
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RESTRICTED
NAVY DEPARTMENT, BUREAU OF ORDNANCE, WASHINGTON, D.C.
To all holders of Ordnance Pamphlet 909
Insert change; write on cover "Change I entered.'
Approved by The Chief of The Bureau of Ordnance
|
OP 909 CHANGE 1
7 July 1944
Page -- Page 1
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ORDNANCE PAMPHLET 909
is changed as follows:
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MOUNTS-ASSEMBLIES -20 MM.
Mounts Mk 2, Mk 2 Mod 1, Mk 2 Mod 21
Mk 4, Mk 4 Mod 1, Mk 4 Mod 2, Mk 4 Mod 3;
Mk 5, Mk 5 Mod I, Mk 5 Mod 3, Mk 5 Mod 4;
Mk 6; Mk 10 and Mk 10 Mod 1 - Description
|
1. Wherever extra light mineral oil NS 1042, 2075, or 2110, or medium mineral oil NS 1065, or
3065 is now specified light preservative oil 0rdnance Specification 1362 should be used.
2. Wherever oil mixture OE 3533 is- now specified, transformer oil NDS 14-0-12 or a mixture of
85% extra light oil NS 1042, 2110, or 2075, and 15% Diesel fuel oil NDS -7-0-2 should be used.
3. Where anti-seize compound NS 52-0-19 (INT) is specified, bearing grease Ordnance Specification 1350 should be used.
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ORDNANCE PAMPHLET NO. 909
MOUNTS
ASSEMBLIES
20 MM MOUNTS MARK 2, MARK 2 MOD. 1, MARK 2
MOD. 2; MARK 4, MARK 4 MOD. 1 MARK 4 MOD. 2,
MARK 4 MOD. 3; MARK 5, MARK 5 MOD. 1, MARK 5
MOD. 3, MARK 5 MOD. 4; MARK 6; MARK 10 AND
MARK 10 MOD. 1
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DESCRIPTION
MARCH 1943
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2
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This page is blank.
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3
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PREFACE
20 mm. A.A. Gun Mounts Mark 2, Mark 2 Mod. 1, Mark 2 Mod. 2; Mark 4, Mark 4 Mod. 1, Mark 4 Mod. 2, Mark 4 Mod. 3; Mark 5, Mark 5 Mod. 1, Mark 5 Mod. 3, Mark 5 Mod. 4; Mark 6; Mark 10 and Mark 10 Mod. 1.
This Ordnance Pamphlet, No. 909, describes the construction, operation, and maintenance of the various 20 mm. A.A. Gun Mounts now in service.
Additional Ordnance publications relating to the use of the 20 mm. A.A. Guns and Mounts are:
| O.P. 911- |
20 mm. Machine Gun Mechanisms Marks 2 and 4; |
|
20 mm. Guns Marks 2, 3, 4, and 4 Mod. 1; |
|
20 mm. Sights Marks 2, 4, 4 Mod. 1, and 5; |
|
20 mm. Hand Grips and Shoulder Rests Marks 2, 4, and 5. |
| O.D. 4429- |
Gun Sight Mark 14 Mod. 2-Installation and Operation. |
| Sk. No. 103308- |
20 mm. Machine Gun and Mount Index. |
The Mark 2 Mount is built to British standards and specifications in this country, but it has been issued by the U. S. Navy as well as the British Admiralty. In this mount the trunnion height is varied by means of a handwheel operating, through a train of gears, a screw inside the stand.
The Mark 4 Mount is identical in operation and almost identical in appearance to the Mark 2 Mount. The Mark 4 Mount has the cocking cable wound around the stand and secured to a hook at one end and a snap at the other. The Mark 2 Mount Cocking Cable is secured to a spring loaded reel which is housed within the stand. The Mark 4 Mount is built to U. S. standards and specifications and is issued by both the U. S. Navy and British Admiralty.
Mark 5 Mount is a Fixed Trunnion Height type. The use of Mounts Mark 5 is a temporary expedient and these mounts will be replaced on Naval Vessels by Mounts Marks 2, 4, 6, or 10, when available. A limited number of Mark 5 Mounts have been issued for installation in Merchant Vessels and these mounts are considered to be practical for this purpose.
Mark 5 Mod. 4 Mount is for use on submarines. It is of the Fixed Trunnion Height type with a shorter pedestal than used on the Mark 5 Mount. Also it has a number of holes drilled in the pedestal to permit sea water to drain out when the submarine is surfaced.
The Mark 6 Mount is an Adjustable Trunnion Height hydraulically operated type. The height of the trunnion is varied by a hydraulic system operated by foot pedals located in the pedestal.
Mark 10 Mount is a Fixed Trunnion Height type. The stand is a weldment of steel stampings, instead of a casting such as used on other types of 20 mm. A.A. Gun Mounts.
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4
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This page is blank.
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5
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TABLE OF CONTENTS
| NOTE- |
Plate 1 is the folded insert of Marks 2 and 4 Gun Mount at page 56.
Plate 2 is the folded insert of Mark 5 Mod. 3 Gun Mount at page 72.
Plate 3 is the folded insert of Mark 6 Gun Mount at page 120.
|
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Text
Page |
Illus.
Fig. No. |
| Preface |
3 |
|
| Chapter 1 |
| GENERAL CHARACTERISTICS |
| Mark 2 Mod. 2, Mark 4 Mod. 2, and Mark 4 Mod. 3 Mounts |
11 |
|
| Mark 5 Mod. 3 Mount |
11 |
|
| Mark 5 Mod. 4 Mount |
12 |
|
| Mark 6 Mount |
13 |
|
| Mark 10 and Mark 10 Mod. 1 Mounts |
14 |
|
| Index of 20 mm. A.A. Gun Mount Marks and Modifications |
15 |
|
| Chapter 2 |
| MARK 2 MOD. 2, MARK 4 MOD. 2, and MARK 4 MOD. 3 MOUNTS |
| Description-Mark 2 Mod. 2 and Mark 4 Mod. 2 |
19 |
1 |
| Description-Mark 4 Mod. 3 |
24 |
|
| Construction |
21 |
2-3 Plate 1 |
| Operation |
22 |
|
| Lubrication |
27 |
4 |
| Stripping-Mark 4 Mod. 2 and Mark 4 Mod. 3 |
29 |
6 to 12 incl. |
| Tools |
30 |
5 |
| Reassembly-Mark 4 Mod. 2 and Mark 4 Mod. 3 |
38 |
13 to 17 incl. |
| Equalizing Spring Stripping |
47 |
18-19 |
| Equalizing Spring Reassembly |
51 |
18-19 |
| Stripping-Mark 2 Mod. 2 |
53 |
|
| Reassembly-Mark 2 Mod. 2 |
54 |
|
| Chapter 3 |
| MARK 5 MOD. 3 MOUNT |
| Description |
59 |
|
| General |
59 |
20 Plate 2 |
| Detailed |
59 |
20 and 21 |
| Pedestal and Pivot |
59 |
|
| Carriage |
59 |
|
| Cradle |
61 |
|
| Gunner's Platform |
61 |
|
| Carriage Lock |
61 |
|
| Trunnion Bracket and Pivot Locking Bolt |
61 |
|
| Gun Securing Bolt |
61 |
|
| Cartridge Bag |
61 |
|
|
6
|
Chapter 3 (Cont'd)
|
| MARK 5 MOD. 3 MOUNT |
|
|
Test
Page |
Illus.
Fig. No. |
| Lubrication |
63 |
22 |
| Operation |
64 |
|
| Pivot Thrust Bearing Adjustment |
65 |
21 |
| Stripping |
66 |
Plate 2 |
| Magazine |
66 |
|
| Sight |
66 |
|
| Shoulder Rest |
66 |
|
| Gun |
66 |
|
| Cartridge Bag Assembly |
66 |
|
| Weight and Band Assembly |
66 |
|
| Shield Assemblies |
66 |
|
| Cradle Assembly |
67 |
|
| Carriage Assembly |
67 |
|
| Pivot Retainer |
68 |
|
| Pivot |
68 |
|
| Reassembly |
69 |
21 Plate 2 |
| Pivot |
69 |
|
| Pivot Retainer |
69 |
|
| Carriage Assembly |
69 |
|
| Pivot Oil Level |
70 |
|
| Cradle Assembly |
70 |
23 |
| Weight and Band Assembly |
71 |
|
| Cartridge Bag Assembly |
71 |
|
| Shield Assemblies |
71 |
|
| Chapter 4 |
| MARK 5 MOD. 4 MOUNT |
| Description |
75 |
|
| General |
75 |
|
| Service Data |
75 |
|
| Cleaning |
75 |
|
| Lubrication |
75 |
24 |
| Chapter 5 |
| MARK 6 MOUNT |
| Description |
79 |
|
| General |
79 |
25 Plate 3 |
| Detailed |
79 |
26 |
| Base |
79 |
|
| Ram Cylinder |
79 |
|
| Pedestal Casing |
81 |
|
| Ram |
81 |
|
| Carriage |
81 |
|
| Cradle |
81 |
|
|
7
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Chapter 5 (Cont'd)
|
| MARK 6 MOUNT |
|
Test
Page |
Illus.
Fig. No. |
| Hydraulic Operating and Control Mechanism |
81 |
27 |
| Oil Tank |
81 |
|
| Oil Pumps and Pump Pedals |
83 |
|
| Pump Valves and Valve Sleeves |
83 |
|
| Carriage Lock |
83 |
|
| Cradle Lock |
83 |
|
| Gun Securing Bolt |
84 |
|
| Cartridge Bag Assembly |
84 |
|
| Lubrication |
86 |
28 |
| Cradle Lock Plunger |
86 |
|
| Carriage Lock Plunger |
86 |
|
| Hydraulic System-Oil Tank |
86 |
|
| Piston Rod Bearings |
86 |
|
| Pedal Lever Pivot Bearings |
86 |
|
| Ram Bearing |
86 |
|
| Gun Securing Bolt |
86 |
|
| Cradle Cocking Sheave |
86 |
|
| Cradle Trunnion Pins |
86 |
|
| Operation of Mount |
87 |
|
| To Raise the Carriage |
87 |
|
| To Lower the Carriage |
87 |
|
| Splinter Bulwarks |
88 |
29 |
| Description of Hydraulic Operation |
89 |
30 to 33 incl. |
| Stripping |
93 |
Plate 3 |
|
| Magazine |
93 |
|
| Sight |
93 |
|
| Cartridge Bag Assembly |
93 |
|
| Weight and Band Assembly |
93 |
|
| Draining Oil |
93 |
|
| Ram Spring Retainer Plug-Removal |
94 |
34 |
| Ram Spring Retainer Plug-Safety Position |
94 |
47 |
| Ram Spring Retainer |
95 |
|
| Shoulder Rest |
95 |
|
| Gun |
95 |
|
| Shield Assemblies |
95 |
|
| Cradle Assembly |
95 |
|
| Ram Cylinder Sleeve |
96 |
|
| Carriage Assembly |
96 |
|
| Ram Cylinder Sleeve |
96 |
|
| Ram Spring and Tube Assembly-Removal |
96 |
35 |
| Pedal Opening Cover |
96 |
|
| Pedestal Casing |
97 |
|
| Pump Piston Rod Link |
97 |
|
| Pump Lever Bracket Assembly |
97 |
|
| Pump Assembly |
97 |
36 |
| Base Air Vent |
97 |
|
| Oil Tank Assembly |
97 |
|
| Ram and Ram Cylinder |
98 |
|
|
8
|
| Chapter 5 (Cont'd) |
| MARK 6 MOUNT |
|
|
Text
Page |
Illus.
Fig. No. |
| Ram |
98 |
43 |
| Ram Cylinder |
99 |
|
| Base Assembly |
99 |
37 and 38 |
| Intake Valves |
100 |
40 |
| Outlet Valves |
100 |
40 |
| Ram Spring and Tube Assembly-Stripping |
100 |
18 and 39 |
| Reassembly |
104 |
40 Plate 3 |
| Base Assembly |
104 |
|
| Pump Valves-Outlet |
104 |
41 and 42 |
| Pump Valves-Intake |
104 |
|
| Ram Cylinder |
105 |
|
| Ram |
105 |
43 |
| Ram Cylinder |
107 |
44 |
| Base Air Vent |
109 |
|
| Oil Tank Assembly |
109 |
45 |
| Oil Pumps-Reassembling |
109 |
46 |
| Oil Pump Assemblies-Installation |
110 |
|
| Pump Pedals |
110 |
|
| Pedestal Casing |
110 |
|
| Cylinder Sleeve |
111 |
|
| Ram Spring and Tube Assembly-Reassembling |
111 |
18, 39, and 47 |
| Ram Spring and Tube Assembly-Installation |
112 |
48 |
| Carriage Assembly-Reassembling |
113 |
|
| Carriage Assembly-Installation |
113 |
|
| Cradle Assembly-Reassembling |
113 |
|
| Cradle Assembly-Installation |
114 |
49 |
| Shield Assemblies |
115 |
|
| Ram Spring Retainer |
115 |
|
| Cylinder Sleeve |
115 |
|
| Ram Spring Retainer Plug |
115 |
50 |
| Ram Air Vent Valve Assembly |
115 |
|
| Filling Hydraulic System |
116 |
|
| Bleeding |
116 |
51 |
| Ram Cover |
117 |
|
| Weight and Band Assembly |
117 |
|
| Cartridge Bag Assembly |
117 |
|
| Casing Hole Cover |
118 |
|
| Cylinder Sleeve Set Screw |
118 |
|
| Lubrication |
118 |
|
| Tools |
120 |
52 |
| Chapter 6 |
| MARK 10 and MARK 10 MOD. 1 MOUNTS |
| Description |
125 |
53 |
|
| General |
125 |
|
| Pedestal and Pivot-Mark 7 and Mark 7 Mod. 1 |
125 |
|
| Carriage-Mark 7 |
125 |
|
| Shield-Mark 4 Mod. 1 |
126 |
|
|
9
|
| Chapter 6 (Cont'd) |
| MARK 10 MOUNT |
|
Text
Page |
Illus.
Fig. No |
| Ring Step |
126 |
|
| Pivot Thrust Bearing Adjustment |
128 |
|
| Stripping and Reassembly |
128 |
|
| Lubrication |
128 |
54 and 55 |
| Instructions for Ordering Replacement Parts |
133 |
|
| Parts List |
|
| MARK 2 MOD. 2 MOUNT |
|
| Cradle-Mark 2 Mod. 2 |
135 |
|
| Carriage-Mark 2 |
140 |
|
| Stand-Mark 2 |
145 |
|
| Shield-Mark 2 |
160 |
|
| MARK 4 MOD. 2 MOUNT |
|
| Cradle-Mark 4 Mod. 2 |
135 |
|
| Carriage-Mark 4 |
140 |
|
| Stand-Mark 4 |
145 |
|
| Shield-Mark 4 |
160 |
|
| Tools |
198 |
|
| MARK 4 MOD. 3 MOUNT |
|
| Cradle-Mark 5 |
163 |
|
| Carriage-Mark 4 Mod. 1 |
163 |
|
| Stand-Mark 4 |
166 |
|
| MARK 5 MOD. 3 MOUNT |
|
| Cradle-Mark 4 Mod. 2 |
169 |
|
| Carriage-Mark 5 |
172 |
|
| Stand-Mark 5 |
175 |
|
| Shield-Mark 4 |
176 |
|
| MARK 6 MOUNT |
|
| Cradle-Mark 5 |
179 |
|
| Carriage-Mark 6 |
182 |
|
| Stand-Mark 6 |
184 |
|
| Shield-Mark 4 Mod. 1 |
192 |
|
| MARK 10 MOUNT |
|
| Carriage-Mark 7 |
195 |
|
| Stand-Mark 7 |
197 |
|
| Cross Index to OE and Bureau of Ordnance Numbers |
201 |
|
|
10
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|
11
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GENERAL CHARACTERISTICS
Chapter 1
|
| Mark 2 Mod. 2, Mark 4 Mod. 2, and Mark 4 Mod. 3 Mounts |
|
| Type |
Adjustable trunnion height, handwheel operated through mechanical gearing to jack screw lift. |
| Working Circle-Diameter |
10 Feet |
| Distance from mount centerline to face of shoulder pad (with Mark 4 shoulder rest)-Gun horizontal |
35 1/2 Inches |
| Elevation Limits-Above horizontal |
87 Degrees |
| -Below horizontal. |
5 Degrees |
| Training Limits |
Unlimited* |
| Height of Trunnion-Column extended |
62 1/4 Inches |
| Height of Trunnion-Column retracted |
46 1/2 Inches |
| Holding Down Bolts |
|
| Number of Holes-Equally spaced |
5 |
| Diameter of Holes |
1 5/32Inches |
| Diameter of Bolts |
1 1/8 Inches |
| Diameter of Bolt Circle |
26 3/8 Inches |
| Stand Bearing Diameter-Outside. |
29 1/2 Inches |
| -Inside. |
24 Inches |
| Weights |
| Stand-Mark 4 |
1103 Pounds |
| Stand-Mark 4 Mod. 1 |
Pounds |
| Carriage-Mark 4 |
88 Pounds |
| Carriage-Mark 4 Mod. 1 |
Pounds |
| Cradle-Mark 4 Mod. 2 |
83 Pounds |
| Cradle-Mark 5 |
84 Pounds |
| Mount-Mark 4 Mod. 2 |
1274 Pounds |
| Mount-Mark 4 Mod. 3 |
Pounds |
| Shield-Mark 4 |
238 Pounds |
| Shield-Mark 4 Mod 1 |
241 Pounds |
| Shoulder Rest-Mark 4 |
20 Pounds |
| Sight-Mark 4 Mod. 1 |
13 Pounds |
| Gun Mechanism (without magazine)-Mark 4 |
|
| Ribbed Barrel |
141 Pounds |
| Solid Barrel |
150 Pounds |
| Total weight, gun mechanism (solid barrel) and mount assembly Mark 4 Mod. 2 of above components |
1695 Pounds |
| For other characteristics see Working Circle Drawing, No. 299907. |
| Mark 5 Mod. 3 Mount |
| Type |
Fixed Trunnion Height |
| Working Circle-Diameter |
10 Feet |
| Distance from mount centerline to face of shoulder pad (with Mark 4 shoulder rest)-Gun horizontal. |
35 1/2 Inches |
| Elevation Limits-Above horizontal. |
87 Degrees |
| -Below horizontal |
5 Degrees |
| Training Limits |
Unlimited* |
| Trunnion Height |
62 1/4 Inches |
*Train limited by the length of power cable when mounts are equipped with Mark
|
12
|
| MARK 5 MOD. 3 MOUNT (Cont'd) |
| Oil Capacity |
1.65 or 1.95 Pounds. (See Operation No. 1 page 69). |
| Holding Down Bolts |
|
| Number of Holes-Equally spaced |
5 |
| Diameter of Holes |
1 5/32 Inches |
| Diameter of Bolts |
1 1/8 Inches |
| Diameter of Bolt Circle. |
26 3/8 Inches |
| Stand Bearing Diameter-Outside |
29 1/2 Inches |
| -Inside |
23 1/2 Inches |
| Weights |
|
| Stand-Mark 5 |
963 Pounds |
| Carriage-Mark 5 |
63 Pounds |
| Cradle-Mark 4 Mod. 2 |
83 Pounds |
| Mount-Mark 5 Mod. 3 |
1109 Pounds |
| Shield-Mark 4 |
238 Pounds |
| Shoulder Rest-Mark 5 |
28 Pounds |
| Sight-Mark 4 Mod. 1 |
13 Pounds |
| Gun Mechanism (without magazine)-Mark 4 |
| Ribbed Barrel |
141 Pounds |
| Solid Barrel |
150 Pounds |
| Total weight, gun mechanism (solid barrel) and mount assembly of above components |
1538 Pounds |
| For other characteristics see Working Circle Drawing, No. 299908. |
|
| Mark 5 Mod. 4 Mount |
| Type |
Fixed Trunnion Height |
| Working Circle-Diameter |
10 Feet |
| Distance from mount centerline to face of shoulder pad (with Mark 5 shoulder rest)-Gun horizontal |
38 1/2 Inches |
| Elevation Limits-Above horizontal |
87 Degrees |
| -Below horizontal |
5 Degrees |
| Training Limits |
Unlimited* |
| Trunnion Height |
50 3/4 Inches |
| Holding Down Bolts |
|
| Number of Holes-Equally spaced. |
5 |
| Diameter of Holes |
1 5/32 Inches |
| Diameter of Bolts |
1 1/8 Inches |
| Diameter of Bolt Circle |
26 3/8 Inches |
| Stand Bearing Diameter-Outside. |
29 1/2 Inches |
| -Inside |
23 1/2 Inches |
| Weights |
|
| Stand-Mark 5 Mod. 2 (no lap at weld) |
827 Pounds |
*Train limited by the length of power cable when mounts are equipped with Mark 14 Mod. 2 gun sight.
|
13
|
| MARK 5 MOD. 4 MOUNT (Cont'd) |
| Carriage-Mark 5 |
63 Pounds |
| Cradle-Mark 4 Mod. 2 |
83 Pounds |
| Mount-Mark 5 Mod. 4 (no lap at weld) |
973 Pounds |
| Shield-Mark 4 |
238 Pounds |
| Shoulder Rest-Mark 5 |
20 Pounds |
| Sight-Mark 4 Mod. 1 |
13 Pounds |
| Gun Mechanism (without magazine)-Mark 4 |
|
| Ribbed Barrel |
141 Pounds |
| Solid Barrel |
150 Pounds |
| Total weight, gun mechanism (solid barrel) and mount assembly (no laps at weld) of above components |
1394 Pounds |
| For other characteristics see Working Circle drawing, No. 299908. |
| Mark 6 Mount |
| Type |
Adjustable trunnion height, foot pedal operated hydraulic lift. |
| Working Circle |
10 Feet |
| Distance from mount centerline to face of shoulder pad (with Mark 5 shoulder rest)-Gun horizontal |
40 1/2 Inches |
| Elevation Limits-Above horizontal. |
90 Degrees |
| -Below horizontal |
15 Degrees |
| Training Limits |
Unlimited* |
| Height of Trunnion |
| Column Extended |
68 3/8 Inches |
| Column retracted |
44 3/4 Inches |
| Holding Down Bolts |
|
| Number of Holes-Equally spaced. |
5 |
| Diameter of Holes |
1 5/32 Inches |
| Diameter of Bolts |
1 1/8 Inches |
| Diameter of Bolt Circle |
26 3/8 Inches |
| Stand Bearing Diameter-Outside |
30 1/4 Inches |
| -Inside. |
19 1/2 Inches |
| -Clearance Circle over heel lugs |
38 Inches |
| Weights |
|
| Stand-Mark 6 (with oil) |
1110 Pounds |
| Carriage-Mark 6 |
79 Pounds |
| Cradle-Mark 5 |
84 Pounds |
| Mount-Mark 6 (with oil) |
1273 Pounds |
| Shield-Mark 4 Mod. 1 |
241 Pounds |
| Shoulder Rest-Mark 5 |
20 Pounds |
| Sight-Mark 5 |
7 Pounds |
| Gun Mechanism (without magazine)-Mark 4 |
|
| Ribbed Barrel |
141 Pounds |
| Solid Barrel |
150 Pounds |
*Train limited by the length of power cables when mounts are equipped with Mark 14 Mod. 2 gun sight.
|
14
|
| MARK 6 MOUNT (Cont'd) |
| Total weight, gun mechanism (solid barrel) and mount assembly of above components |
1691 Pounds |
| For other characteristics see Working Circle Drawing, No. 300047. |
|
| Mark 10 and Mark 10 Mod. 1 Mounts |
| Type |
Fixed Trunnion Height |
| Working Circle-Diameter |
10 Feet |
| Distance from mount centerline to face of shoulder pad (with Mark 5 shoulder rest)-Gun horizontal |
41 7/8 Inches |
| Elevation Limits-Above horizontal |
90 Degrees |
| -Below horizontal |
15 Degrees |
| Training Limits |
Unlimited* |
| Trunnion Height |
52 1/2 Inches |
| Holding Down Bolts |
|
| Number of Holes-Equally spaced |
5 |
| Diameter of Holes |
1 5/32 Inches |
| Diameter of Bolts |
1 1/8 Inches |
| Diameter of Bolt Circle |
26 3/8 Inches |
| Stand Bearing Diameter-Outside |
29 1/2 Inches |
| -Inside |
23 1/4 Inches |
| Weights |
| Stand-Mark 7 |
Pounds |
| Stand-Mark 7 Mod. 1 |
Pounds |
| Carriage-Mark 7 |
Pounds |
| Cradle-Mark 5 |
84 Pounds |
| Mount-Mark 10 |
Pounds |
| Mount-Mark 10 Mod. 1 |
Pounds |
| Shield-Mark 4 Mod. 1 |
241 Pounds |
| Shoulder Rest-Mark 5 |
28 Pounds |
| Sight-Mark 5 |
7 Pounds |
| Gun Mechanism (without magazine) |
|
| Ribbed Barrel |
141 Pounds |
| Solid Barrel |
150 Pounds |
| Total weight, gun mechanism (solid barrel) and mount assembly of above components |
Pounds |
For other characteristics see Working Circle Drawing, No. 329826.
*Train limited by the length of power cables when mounts are equipped with Mark 14 Mod. 2 gun sight.
|
15
|
| MARKS AND MODIFICATIONS |
MOUNT
MARK |
STAND
MARK |
CARRIAGE
MARK |
CRADLE
MARK |
SHIELD
MARK |
TYPE
MARK |
| 2 |
2 |
2 |
2 |
2 |
MECHANICAL |
| 2 MOD. 1 |
2 |
2 |
2 MOD. 1 |
2 |
MECHANICAL |
| 2 MOD. 2 |
2 |
2 |
2 MOD. 2 |
2 |
MECHANICAL |
| 4 |
4 |
4 |
4 |
4 |
MECHANICAL |
| 4 MOD. 1 |
4 |
4 |
4 MOD. 1 |
4 |
MECHANICAL |
| 4 MOD. 2 |
4 |
4 |
4 MOD. 2 |
4 |
MECHANICAL |
| 4 MOD. 3 |
4 MOD. 1 |
4 MOD. 1 |
5 |
4 MOD. 1 |
MECHANICAL |
| 5 |
5 |
5 |
4 |
4 |
FIXED |
| 5 MOD. 1 |
5 |
5 |
4 MOD. 1 |
4 |
FIXED |
| 5 MOD. 3 |
5 |
5 |
4 MOD. 2 |
4 |
FIXED |
| 5 MOD. 4 |
5 MOD. 2 |
5 |
4 MOD. 2 |
4 |
FIXED (Sub.) |
| 6 |
6 |
6 |
5 |
4 MOD. 1 |
HYDRAULIC |
| 10 |
7 |
7 |
5 |
4 MOD. 1 |
FIXED (Tripod) |
| 10 MOD. 1 |
7 MOD. 1 |
7 |
5 |
4 MOD. 1 |
FIXED (Tripod) |
|
16
|
|
|
17
|
|
|
|
|
