Revision 6
II.
High Pressure Water Jetting Unit Repairs
A.
High Pressure Pump
1.
Fluid
End
Because
of
the precise machining and stringent metallurgical specifications required for safe
and proper operation, only NLB parts should be used when repairing the high pressure
pump.
Maintenance will be required
if
the leakage from any packing exceeds six (6) drops per
second,
if
any other part allows any water
to
leak, or
if
the pump is not performing properly.
The following procedure provides for disassembly and repair
of
the complete liquid end.
Repair
of
only one part
of
the liquid end will not require complete disassembly.
Note:
Refer to Section 9: PARTS for breakdowns
and
parts lists for the following
procedures:
a.
Plunger Packing and Stuffing Boxes
Service People Required: 1
Recommended Tools:
Pliers, 1-1/2" combination wrench, 36" pipe wrench, medium flat
blade screwdriver,
Special Tool (ST 1-5/8" Socket Adapter), 3/4" socket and ratchet wrench,
small pry bar,
Special Tool (PD-33A Packing Drift, A-Cylinders or PD-34B Packing Drift,
B-Cylinders), medium size ball-peen hammer, feeler gauge,
0-ring
pick, 3/4" drive torque
wrench
200-600 lb.-ft. (270-810 Nm) and a 3/4" drive torque wrench 15-100 lb.-ft.
(20.2-135 Nm)
Parts
(Subject to inspection): Packings, plungers, bushings, stuffing boxes, & backup rings
Supplies: 10 oz. (300 ml) cup
of
SAE 15W40 oil, bottle of blue LOCTITE®, and a tube of
light grease
WARNING:
DISCONNECT THE BATTERY NEGATIVE(-) CABLE FIRST. BLEED DOWN ALL
HIGH PRESSURE LINES.
PUT
A "DO
NOT
OPERATE"
TAG
ON THE
CONTROLS. FAILURE
TO
DO SO
MAY
RESULT
IN
DAMAGE
TO
EQUIPMENT
AND/OR PERSONAL
INJURY.
© Copyright October,
2001
NLB Corporation
8-7
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