XM Wheeled Dry Chemical Fire Extinguisher
Operation and Maintenance Manual
(Part No. S-50651)
PAGE 14 REV. 02 2023-AUG-30
MAINTENANCE
MAINTENANCE (Continued)
7. Disconnect the nitrogen hose from the regulator to the tank
inlet and check interior of hose coupling for any signs of dry
chemical residue. If dry chemical residue is present, see
Service and repair, Table 8. Perform corrective action as
indicated – “Residual dry chemical in nitrogen hose coupling.”
FIGURE 23
002675
NOTICE
It may be necessary to remove the hose
and nozzle from its support in order to gain
access to the nitrogen tank inlet.
8. If no dry chemical residue is present, reconnect the nitrogen
hose to the tank inlet and the regulator and wrench tighten.
Complete the remaining maintenance steps.
9. Remove the safety shipping cap from the nitrogen cylinder.
Retain shipping cap for future use.
!
WARNING
Do not place body or head in front of nitrogen cylinder
valve outlet. If valve is accidentally operated, velocity of
unrestricted escaping gas is forceful enough to cause
injury, especially about the face and head.
10. Connect the high pressure hose to the nitrogen cylinder valve,
using a 1 1/8 in. open-end wrench.
FIGURE 24
002651
11. Check the dry chemical tank by completing the following
steps:
a. Remove the ll cap and check the pressure relief vent (in
cap) for obstructions.
FIGURE 25
002679
b. Examine the ll cap gasket for elasticity, cuts, or weather
checking. Clean and coat the gasket lightly with a good
grade of high heat-resistant grease, then replace.
c. Inspect the threads in the ll cap and on the ll opening
for nicks, burrs, cross-threading, and rough or feathered
edges. Clean and coat the ll cap threads lightly with a
good grade of high heat-resistant grease.
d. Make sure the tank is only lled with free-owing ANSUL®
dry chemical to a level of not more than 6 in. (15 cm) from
the bottom of the ll opening.
FIGURE 26
002681
NOTICE
Do not replace fill cap at this time.
12. Examine the nozzle opening for obstructions.
13. Operate the nozzle handle to check for freedom of movement.
Replace the nozzle on holder.
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