Section 8
High Pressure Water System
20425618
5-2005/Rev 0
8-38
8.16 Weep Holes
High pressure seals and connections fail gradually and begin leaking slowly. Weep holes are
located at every threaded high pressure connection to provide a vent for internal leaks. Water or
oil dripping from a weep hole indicates one or more internal components are beginning to fail.
Table 8-3 lists the location of the weep hole, the possible source of the leak and the corrective
action required.
Table 8-3
Weep Holes
High Pressure Water System
Location Indication Comments
Hydraulic Cylinder Head
Hydraulic oil leaking from the
weep hole in the hydraulic
cylinder head
Failed hydraulic cartridge seal Replace the cartridge seal. If the
leak persists, check the plunger
for linear scratches or scoring.
Failed high pressure seal
assembly
Replace the high pressure seal
assembly.
Damaged plunger Check the plunger for
longitudinal scratches or flaws. If
detected, replace the plunger or
return to KMT for evaluation and
rework.
Seal material buildup on plunger Polish the plunger surface
following the procedure, Plunger
Maintenance.
Check for scratches, grooves or
material buildup on the inside
diameter of the cylinder. If
detected, polish the bore
following the procedure, High
Pressure Cylinder Maintenance.
Water leaking from the weep
hole on the hydraulic cylinder
head flange
Damaged high pressure cylinder
Check the inside diameter of the
cylinder for expansion where the
high pressure seal assembly is
located. If detected, replace the
cylinder.
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