Stoelting U421 Operator's Manual page 23

B.4
Unfasten the wire clamp on the
check valve block by swinging
the clamp to the right. Remove
the check valve.
B.5
Loosen the clamp on the mix tube at the top of the
cab and remove the hose from the tube.
B.6
Remove the two o-rings from the
base of the check valve block.
B.7
Remove the hose assemblies from the cab.
Loosen all clamps and disconnect all hoses from the
low mix sensor and check valve block.
513725 REV.0
2. Inspect and Cleaning
U421-I2 & U431-I2 OPERATOR'S MANUAL
Section 3: Maintenance
B.8
Inspect all the parts for wear and replace as necessary.
B.9
Thoroughly clean the parts with 90° to 110°F detergent
water and brushes provided. Rinse with clean, 90° to
110°F water.
B.10
Wash the mix tube and the check
valve base in the cabinet with the
detergent water and brushes.
Rinse with clean, 90° to 110°F
water.
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