TM 5-3895-359-14&P
SERVICE INSPECTION AND MAINTENANCE
C. MAINTENANCE
A. SERVICE TOOLS
1. All openings in the circuit must be properly
The only special service tool required is a shaft oil seal
capped if a unit is removed for service. Units removed
driver. The driver is used to insure that the seal is not
also should be capped or plugged to prevent the entry of
damaged during installation. A piece of tubular round
dirt or other foreign matter.
stock should be machined so that the outside diameter
2. These pumps require no adjustments other than
is 1-5/8 inches and the inside diameter is 1 inch. The
maintaining correct shaft alignment.
tool must be at least 2-1/2 inches long and the ends
must be squared.
D. LUBRICATION
Lubrication of these pumps
is
automatically
B. INSPECTION
accomplished by the hydraulic fluid.
Periodic inspection of oil condition and pressure
connections will save time consuming breakdowns and
E. TROUBLE SHOOTING
unnecessary parts replacement.
Table II lists the pump difficulties most commonly
encountered and indicates the probable causes and
1. All hydraulic connections must be tight. A loose
remedies. It must be remembered that many apparent
connection in pressure lines will allow fluid to escape. In
pump failures can actually be other units in the system.
suction and return lines, loose connections will permit air
Improper operation is best diagnosed with adequate
in the pump, resulting in noisy and erratic operation.
testing equipment and a thorough understanding of the
complete hydraulic system.
2. System filters and the reservoir should be
checked for foreign particles. If contamination is found,
F. SPARE PARTS
the system should be drained.
Only genuine parts manufactured or sold by Vickers
a. The reservoir must be cleaned thoroughly
Incorporated should be used. These are listed in parts
before refilling. All lint particles must be removed to
catalog M-1370-S. Copies are available on request.
avoid possible clogging of system filters.
b. New oil of the proper specification, poured
through a micron filter or a 200 mesh screened funnel,
should be used to refill the reservoir.
TROUBLESHOOTING
TABLE II - TROUBLE SHOOTING CHART
TROUBLE
PROBABLE CAUSE
REMEDY
PUMP NOT DELIVERING OIL
Driven in wrong direction of rota-
Check direction of pump shaft ro-
tion.
tation. It should rotate clockwise
as viewed from the coupling end of
the unit.
See also reassembly instructions
for pump cartridge.
Pump drive shaft disengaged or
Remove pump. Determine damage
sheared.
to cartridge parts (see disassembly
instructions). Replace sheared shaft
and needed parts.
Flow control valve stuck open.
Disassemble pump and wash con-
trol valve in a clean solvent. Re-
turn valve to its bore and slide it
back and forth. No stickiness in
movement should occur. If a gritty
feeling is noted on the valve O.D.
it may be polished with a crocus
cloth. Avoid removal of excess
material or rounding of valve edges
during this operation. Do not at-
tempt to polish the valve bore.
Wash all parts before reassembly
of pump. Fill system with clean oil
per prescribed recommendations.
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