HALE AP, Technical Manual

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108
5.8.7.1.1 Cooling Tube R&R
Perform the following to remove and replace the gearbox cooling tube.
Cooling Tube Removal
A. Disconnect both cooling water lines (at gearbox end of water line).
Remove 90
°
elbow from cooling tube (supply line). 1.
a) Using 1/2-in wrench (or adjustable wrench), hold 90 ° elbow stationary.
b) Using 5/8-in wrench (or adjustable wrench), loosen nut (turn CCW) on cooling tube
side of elbow.
c) Remove nut.
d) Pull 90
°
elbow off cooling tube.
Remove remaining 90
°
elbow from cooling tube (return line). 2.
Repeat steps 1. a) thru d) above.
NOTE
The nuts and the compression rings stay on the cooling tube.
B. Prepare cooling tube for removal.
Using 5/8-in wrench (or adjustable wrench), loosen (turn CCW) supply 1.
side compression nut on adapter (1/2 male NPT X 3/8 tube).
Using 5/8-in wrench (or adjustable wrench), loosen (turn CCW) return 2.
side compression nut on adapter (1/2 male NPT X 3/8 tube).
Slide both nuts out-of-the-way. 3.
NOTE
Use care when cutting the cooling tube NOT to damage the fitting. The compression
ring is NOT reused and can be sacrificed (cut/damaged) without issue. If the fitting is
damaged it requires replacement.
Using a hacksaw, cut gearbox cooling tube between compression ring and 4.
compression fitting.
Remove adapter (1/2 NPT to 3/8 compression). 5.
a) Using 1–1/16-in wrench (or adjustable wrench), loosen (turn CCW) adapter.
NOTE
The cooling tube may require deburring before the adapter can be removed. Do NOT
gouge the inside of the adapter or it may leak.
b) Unscrew adapter and pull adapter off gearbox cooling tube.
C. Remove gearbox cooling tube.
Using a 13 mm wrench (or socket and driver), remove 16 M8 x 1.25 x 1.
20 mm long gearbox cover screws.
Remove 16 washers. 2.
Remove cover. 3.
Pull cooling tube out of gearbox. 4.