Hale MG - Manual (Page 54)

Muscle Pumps
3-11
performance has dropped appreciably
compared to its original performance, it
needs to be serviced. (Apparatus test results
should be on file with the delivery documents.
If not, they may be obtained from the
apparatus manufacturer or from the original
certifying authority).
Repacking
Refer to figure 1-9 for a cross-section showing the
packing arrangement and number of packing rings.
The three rings adjacent to the packing gland can
be replaced without disassembling the pump. The
ring in front of the lantern does not need to be
replaced. Repack the pump as follows.
DO NOT RUN ENGINE WHILE MAKING
PACKING ADJUSTMENT.
1. Loosen the packing nut lock.
2. Loosen the packing gland. If necessary, soak
the threads with penetrating oil and work the
nut back and fourth to loosen it. Loosen the
adjusting gland just enough to remove the split
glands. If the front part of the gland is of the
split type, remove the two halves.
3. Remove the old packing rings with a packing
hook. The hook can be made from a bent piece
of stiff wire or small pointed rod. Another type
of packing hook consists of a corkscrew on the
end of a flexible shaft. Be sure to remove all
shreds of old packing, and clean out the
packing housing as much as possible.
4. Remove all old packing, dirt, and foreign
matter from the bearing housing under the
gland.
5. Repack using the Hale packing kit
recommended for your particular pump. For
most pumps, the packing is 7/16 inch square
cut to the proper length. Wrap one length of
packing around the shaft to form a ring, and
push the ring into the packing housing. Install
the second ring the same way, but stagger the
joint one-third ofthe way around from the
firstjoint. Put a foil separator between each
packing ring. The foil separator must be cut
tofit the shaft. Install the other rings, again
staggering the joints.
6. Replace the gland and adjust it according to
the Packing Gland Adjustment procedure in
this section.
7. Operate the pump normally for about 15
minutes at 130 PSI (9 BAR), and check the
packing gland. If necessary, adjust the packing
nut again according to the Packing Gland
Adjustment procedure in this section.
Annual MIV and 40BD Relief Valve Test and
Adjustment
NEVER SET RELIEF VALVE ABOVE
HOSE MANUFACTURERS RATED
WORKING PRESSURE. ALWAYS USE THE
LOWEST POSSIBLE RELIEF VALVE
SETTING TO ENHANCE OPERATOR AND
EQUIPMENT SAFETY.
PER NFPA 1962 REQUIREMENTS, LARGE
DIAMETER HOSE MARKED “SUPPLY HOSE”
3-1/2 TO 5 INCHES (89 TO 127 MM)
DIAMETER SHALL NOT BE USED AT
OPERATING PRESSURES EXCEEDING 185
PSI (13 BAR).
PER NFPA 1962 REQUIREMENTS, LARGE
DIAMETER HOSE MARKED “SUPPLY HOSE” 6
INCHES (152 MM) DIAMETER SHALL NOT BE
USED AT OPERATING PRESSURES
EXCEEDING 135 PSI (9 BAR).
The 40BD MIV relief valve is factory set to open
at 125 PSI (9 BAR). The relief valve can be
adjusted to open from 75 to 250 PSI (5 to 17