47.
Generator Fails to Function
Probable cause
Possible remedy
Probable cause
Possible remedy
Generator armature or
Replace armature o field
r
Defective seal..................... eplace seal (para 127).
R
field windings
windings (para 108).
Suction strainer or sue-
Clear line or strainer.
defective.
tion line plugged.
Commutator worn,
Turn down commutator and
Impeller clogged, broken, Clean or replace (para 127).
burned, or has high
undercut mica (para 108).
or worn out.
mica.
Chamber not completely Fill chamber (para 27a).
Generator regulator out
Adjust generator regulator
filled for priming.
or
Check valve not seating Remove dirt or debris from
of adjustment or
replace defective regulator
properly.
check valve seat (para
defective.
Generator brush holder
Replace defective commuta
50. Noisy Pump Operation
defective.
tor end frame (para 108).
Probable cause
Possible remedy
48. Starting Motor Does Not Operate Properly
Impeller broke..................... eplace
R
i peller
m
Probable cause
Possible remedy
Brushes worn...................... eplace brushes.
R
Pump bearings defective Replace defective bearings
Starting armature or
Replace armature or field
field windings
windings (para 109).
Pump drive shaft
Replace drive shaft (para
defective.
defective.
127).
Commutator worn,
Turn down commutator and
Excessively high suction Move pump closer to
burned, or has high
undercut mica (para 109).
supply.
mica.
lift causing cavitation.
Starter shaft and pinion
Replace shaft and pinion
51. Pump Fails to Deliver Rated Capacity
defective.
Probable cause
Possible remedy
Starter brush holders
Replace defective brush
Engine lacks speed............ heck governor adjustment
C
defective.
holder(para 109).
Starter bearing
Replace end bells (para
Air leak in suction line........
.
Tighten
connections.
defective
109).
Check
Flywheel spur gear
Replace spur gear (para
for pinholes.
defective.
120).
Suction lift too high ............ ove pump closer to
.
M
49. Pump Fails to Prime
supply.
Total head too high............ earrange
R
sy tem
s
to
Probable cause
Possible remedy
Air leak in suction line
Tighten hose connections.
reduce
Check for pinholes in hose.
elevation between point of
Check for collapsed lining.
delivery and supply.
Impeller partially
Clean impeller (para 127).
clogged.
51.1. Pressure Gages Read Incorrectly or Show No
Readings
Probable cause
Possible remedy
Lines clogged..................... lean lines (para 99.2).
C
Section IV. RADIO INTERFERENCE SUPPRESSION
52.
Definitions
radio-frequency range, they must be suppressed for two
a. Interference The term "interference" as used in
.
important reasons. They will interfere with the proper
this manual applies to electrical disturbances in the
operation of the friendly radio sets, and they will enable
radio-frequency range which are generated by the pump
the enemy to locate the equipment and its associated
engine and which may interfere with the proper
units.
operation of radio receivers or other electronic
equipment.
54.
General Source of Interference
b. Interference Suppression
.
The
term
Generally, radio interference is generated
"Interference suppression" as used in this manual
anywhere a spark occurs or where a high-frequency
applies to the methods used to eliminate or effectively
current is present. A spark is a small amount of current
reduce interference generated by the pump engine.
jumping an air gap in response to the force of a
relatively high voltage. The gasoline engine ignition
system is a common source. Magneto breaker points
53.
Purpose
and static charges collecting on the frame are other
The tactical importance of effective interference
common sources which must be suppressed.
suppression cannot be stressed too greatly. Since the
electrical disturbances generated by the pump engine
are composed partly of electrical waves in the
TAGO 6358-A
26