John Deere 318 - Manual (Page 35)

TUBE AND HOSE FITTING, 37˚ FLARE AND
30˚ CONE SEAT CONNECTOR SERVICE
RECOMMENDATIONS
1. Inspect the flare and the flare seat. They must be free
of dirt and defects. If repeated leaks occur, inspect for
defects with a magnifying glass. If burrs and raised nicks
on the connector body cannot be removed with a slip
stone, replace the connector.
2. Defects in the tube flare cannot be repaired. Replace
the tube. Overtightening a defective flared fitting will not
stop leaks.
3. As a field repair, a ductile truncated cone shaped
washer can be used between the tube flare and
connector body. These washers are soft enough to fill
defects in the seat and flare. They will also seal the
connection. Ductile washers are available from industrial
supply houses.
4. Align the tube with the fitting before attempting to start
the nut. Failure to do so can cause a deformed flare and
subsequent leaks. Install hoses without twists. A twisted
hose attempts to straigten out when pressure is applied.
This exerts a torque on the connection, eventually
causing failure.
5. Lubricate the connection with hydraulic fluid, petroleum
jelly or soap. Tighten the swivel nut by hand until it is
snug.
6. Mark a line across the nut and connector body. This
line will serve as a visual indicator as to whether the nut
has been tightened and by how much.
7. Using two wrenches, one on the connector body and
a torque wrench on the nut, tighten the nut to the torque
value as shown in the chart. In the case of a hose, it
may be necessary to use three wrenches to prevent
twisting.
MX,15901015,4 -19-17JAN95
Repair Specifications/Service Recommendations
TM1590 (17MAY95)
10-15-9
316, 318 & 420 Lawn and Garden Tractors
020895
10
15
9