Hog Technologies SK5500, Operation Manual

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Section 5 - Scheduled Maintenance
1. Plunger Coupling & Bolts 4.
Stuffing Boxes
2. Pony Rods 5. Power Frame
3. Glandnuts
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Jetstream Ultra-high Pressure Pump Bilge
5.10 High Pressure Pump Stuffing
Box Packing Replacement
The packing creates the seal at the Ultra-High
Pressure pump plungers in the stuffing boxes.
When excessive water begins flowing through a
stuffing box, the packing will need to be replaced.
Typical Packing Replacement
The procedure in this section is for packing that
is worn and leaking excessively, but is not stuck.
Use the following procedure to replace the
packing:
1. Identify the stuffing box with the worn or dam -
aged packing.
2. Shutdown the UHP pump, charge water pump
and the water blasting system. Then place the
truck in the service position.
3. Rotate the high pressure pump to move the
pony rod all the way back against the power
frame at the crank shaft end of the pump. This
will provide the clearance required to remove
the gland nut and plunger.
4. Use the 7/8” Allen wrench (Jetstream tool)
supplied in the water blasting tool system.
Insert the round end of wrench into the hole
on the gland nut. Use a 2 lb hammer to hit the
Jetstream tool in a counterclockwise direction
to loosen the gland nut.
5. Use a ratchet wrench and 9/16” socket to
remove the brass plunger coupling bolts and
nuts.
6. Remove the gland nut, plunger and packing
assembly. If the packing will not come out,
refer to the stuck packing removal procedure
in this chapter.
7. Remove the old packing from the plunger. Then
clean debris out of the stuffing box and the
lubrication holes in the gland nut.
8. Check the carbide guide bushing for nicks,
cracks, breaks or excessive wear. Replace if
necessary.