A. Take down the broken parts and cover ports, leaving the rest of the gear intact.

28.  Q. What is to be done if a reverse yoke breaks?

A. If lugs for holding reach rod breaks, block yoke securely at whatever cut-off you wish to work the engine and take down the short reach rod.  If break is below the lugs, do the same as for broken eccentric rod.

29.  Q. What do you do if reach rod should break?

A. If short reach rod breaks, block the yoke at cut-off desired and wire fast so it cannot move.  If main reach rod breaks, block between tumbling shaft arm and cross-tie brace, wiring same securely.

30.  Q. What is to be done if the engine breaks down other than valve gear?

A. In this case do the same as for any other valve.

=Southern valve gear=

1.  Q. If the eccentric crank or eccentric rods fail?

A. Disconnect the eccentric rod from crank, radius hanger and transmission yoke, tie up the hanger and yoke, clamp valve central position and proceed.

2.  Q. If radius hanger fails?

A. Disconnect the hanger from rod and take down eccentric rod, clamp valve in central position and proceed.

3.  Q. If transmission yoke fails?

A. Disconnect from the eccentric rod and clamp valve in central position and proceed.

4.  Q. If horizontal arm of bell crank fails?

A. Disconnect the yoke from the eccentric rod, tie up to clear, clamp valve in central position and proceed.

5.  Q. If vertical arm to bell crank breaks?

A. Clamp valve in central position and proceed.  Take the broken arm down if necessary.

6.  Q. If one auxiliary reach rod or reverse shaft arm fail?

A. Block both link blocks in same position of links, and in such a position as to give port opening enough to start train and control speed by throttle.

7.  Q. If main reach rod, or middle arm to reverse shaft fail?  If both auxiliary reach rods fail?

A. Block link blocks in full valve travel, controlling power and speed with the throttle.

=Lubrication=

1.  Q. What produces friction, and what is the result of excessive friction?

A. Friction as considered in locomotive service is produced by one body being rubbed across the surface of another when they are held in contact by pressure, and the result of excessive friction is heat more or less intense and the destruction of the journal and its bearing or the roughening of the sliding surfaces.

2.  Q. What is lubrication and its object?

A. The object of lubrication is to interpose a film of oil, grease or some lubricant between the two surfaces that will prevent these rubbing surfaces from coming into too intimate contact.

3.  Q. What examinations should be made by the engineer to insure successful lubrication?