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APPENDIX B
SUPPLEMENTARY DATA
 
The following information and instructions were parts of other publications, some of which are no longer available. This supplementary data is included herein, as originally written,   in an effort to furnish all data under one cover. Use of the following material will result in improved operation of the mechanisms concerned.
 

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65
 
Subject: Depth Charge Release Tracks Marks 3, 6 and 9 - Modification of Detent Shaft Bearings for -

Reference: (a) O.P. No. 721 - Depth Charge Release Gear Mark 3.
(b) Ordalt No. 1767 - Depth Charge Release Track Mark 9 and Mods, Instructions for Modifying Detent Shaft Bearings.
(c) Ordalt 1768 - Depth Charge Release Tracks Marks 3 and 6, Instructions for Modifying Detent Shaft Bearings.
(d) O.P. 904 - Depth Charge Release Tracks.

Enclosure:
(herewith)
(A) One copy BuOrd dwg. No. 179171, Revision C
(B) BuOrd dwg. No. 328300, Revision A
(C) One copy BuOrd dwg. No. 179169, Revision D
(D) One copy BuOrd dwg. No. 179170, Revision E
(E) One copy BuOrd dwg. No. 199010, Revision B
(F) One copy BuOrd dwg. No. 328297, Revision C
(G) One copy BuOrd dwg. No. 328298, Revision B

1. Sluggish action of the subject track detent mechanisms has been experienced by various activities. This unsatisfactory operation is caused by excessive bearing friction and stiffening of lubricant at low temperatures. In this connection the alterations covered by references (b) and (c) and adherence to the recommendations as set forth herein are remedial measures.

2. A brief description of the work covered by references (b) and (c) are as follows:

(a) By reference (b) grease grooves have been added to the detent shaft bearing as shown in enclosure (B). The grease fitting has been changed from the straight type to a 90° type. The bearing will be installed with the grease fitting at the bottom.

(b) By reference (c) an additional grease fitting has been added to the detent shaft bearing as shown in enclosure (A). This fitting is located near the inboard end of the bearing at a point where the helical grease groove intersects the vertical centerline at the bottom of the bearing.

 

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3. The subject release tracks now under procurement are fitted with the modified bearing. Release tracks in service and in store will be modified in the field by personnel from tenders, Navy Yards, repair vessels, Naval Stations, Naval Operating Bases, or the Naval Mine Depot, New London, Conn.

4. With respect to maintenance of the Marks 3 and 6 depth charge tracks the following instructions shall be inserted after paragraph 35(a) of reference (a):

(a) Grease, Lubricating, Mineral (Navy Department Specification 14-G-1, Grade II) or Grease, Lubricating Graphite (Federal Specification VV-G-671, Grade AB) shall be used for lubrication at temperatures above 32°F. For temperatures below 32°F, or if operation of gear becomes sluggish, Bearing Grease for General Use in have Ordnance, O.S. No. 1350, shall be used.

(b) The gear shall be lubricated at least weekly. Under conditions of inclement weather and heavy wash of water the frequency of lubrication shall be increased to provide sufficient amount of grease to replace that lost by leaching action of the water.

(c) When practicable, during the application of grease to detent shaft bearings, turn the shafts through several complete revolutions. Proper measures shall be taken to move depth charges forward in the track and secure them clear of detents for the greasing operation. Bell crank pins, drawing No. 179169-5 and 6 (enclosure (C)), shall be removed to uncouple connecting rod, drawing No. 199010-1 and link drawing No. 199010-3 (enclosure (E)), to permit turning shafts. Upon reassembly of linkage, check to insure that position of detents is in accordance with adjustments noted on enclosure (A).

(d) When changing lubricants it is necessary that enough grease be forced through the fitting to displace the old grease. Detent shaft bearings, drawing No. 179170-2 (enclosure (D)), shall be periodically removed from track structure for thorough cleaning. All trace of corrosion shall be removed from bearing surfaces on detent shafts. Bearings shall be suitably marked before removal so that they may be restored to original locations after cleaning. This is.

 

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necessary to obtain correct alignment. After assembly grease shall be applied through fittings as noted in subparagraph (c) above. The 67-1/2 degree type grease fitting located near the inboard end of bearing must be unscrewed before bearing can be removed from track structure.

5. With respect to the Mark 9 depth charge track and modifications, paragraphs 4(a) and 4(b) are applicable while paragraphs 4(0) and 4(d) are changed to read as follows:

(c) When practicable, during the application of grease to detent shaft bearings, turn the shafts through several complete revolutions. Proper measures shall be taken to move depth charges forward in the track and secure them clear of detents for the greasing operation. Bell crank pins, drawing No. 179169-5 and 6 (encl. C), shall be removed to uncouple connecting rod, drawing No. 328298-5(encl. G), and link drawing No. 199010-3 (encl. E), to permit turning shafts. Upon reassembly of linkage, check to insure that position of detents is in accordance with adjustments noted in enclosure (B).

(d) When changing lubricants it is necessary that enough new grease be forced through the fitting to displace the old grease. Detent shaft bearings, drawing No. 328297-2, 3 and 4 (encl. F), shall be removed from track structure, periodically, for thorough cleaning. All trace of corrosion shall be removed from bearing surfaces on detent shafts. Bearings shall be suitably marked before removal so that they may be restored to original locations after cleaning. This is necessary to obtain correct alignment. After reassembly grease shall be applied through fittings as noted in sub-paragraph (c) above.

6. The information included in paragraph 4 will be inserted in a modification of reference (a), and information in paragraph 5 will be inserted in reference (d) when practicable.

 

67a
 

179171
ENCLOSURE (A)
DEPTH CHARGE RELEASE TRACK
MARK III
RELEASE MECHANISM ADJUSTMENT DIAGRAM

 

67b
 

328300
DEPTH CHARGE RELEASE TRACK MARK 9, MODS. 1,2,3, & 4.
RELEASE MECHANISM ADJUSTMENT DIAGRAM

 

67c
 

179169
DEPTH CHARGE RELEASE TRACK
MARK III
RELEASE MECHANISM DETENT AND DETAILS

 

67d
 

179170
DEPTH CHARGE RELEASE TRACK
MARK III
RELEASE MECHANISM SHAFT AND DETAILS

 

67e
 

199010
DEPTH CHARGE RELEASE TRACK
MARK III
RELEASE MECHANISM CONN. ROD AND LINK

 

67f
 

1328297
DEPTH CHARGE RELEASE TRACK MK.9 and MK.9 MODS. 1 2 3 and 4
DETENT SHAFT AND DETAILS

 

67g
 

328298
DEPTH CHARGE RELEASE TRACK-MK.9
BRACKETS AND DETAILS

 

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