Graco Manzel MHH [12/28] Locating and repairing blockages
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Graco Manzel MHH [12/28] Locating and repairing blockages

Graco Manzel MHH [12/28] Locating and repairing blockages
Repair
12 312497A
Locating and Repairing Blockages
1. Make a visual inspection of the system. Check for crushed
lines or improper divider valve installation.
2. Verify that each divider valve outlet required to discharge
lubricant can do so and that no pipe plugs have been
installed in an outlet designed to serve a bearing or
another divider valve.
3. Use a manual pump with a gauge. Fill the pump with
clean, filtered lubricant. Connect the manual pump to the
inlet of the master divider valve and slowly operate pump.
If system will not cycle freely, below 1500 psi, see Master
Divider Valve Equipped with Performance Indicator [Step
4a (below)].
4a. Master Divider Valve Equipped With Performance
Indicator
With manual pump connected to the master divider valve
as outlined in Locating Blockages, Step 3, raise pressure
to 2000 psi. The indicators in the indicator ports will signal
the location of the blockage. An indicator in the up position
indicates pressure is in that outgoing line and signals the
blockage is in the area being served from this outlet (F
IG.
11).
If no indicator pins are protruding, the blockage is in the
master divider valve.
4b. Master Divider Valve Equipped Without Performance
Indicator
1) With manual pump connected to the master divider
valve as outlined in Locating Blockages, Step 3, raise
pressure to 2000 psi.
2) Remove, one at a time, each indicator port plug and
attempt to operate manual pump after each plug is
removed. Do not exceed 2000 psi.
3) If pressure drops and the master cycles freely after
an indicator port plug is removed, then blockage is
downstream in the area that is being served from that
outlet. See Locating Blockages, Step 3.
5. If in Step 4, a blockage has been indicated downstream of
the master divider valve, install a manual pump in the
indicator port of the master divider valve that is common
to the blocked area. (See F
IG. 12).
CAUTION
Use only clean oil filtered to the SAE -recommended
cleanliness level of ISO 18/14 (ISO Standard 4406) when
prefilling a system. The manufacturers of the machine tool
and its component bearings should be consulted to ensure
that the ISO 18/14 cleanliness level is adequate.
FIG. 11
HAND PUMP
LUBE
INDICATOR PIN UP
MASTER
SECONDARY
OUTLETS
DIVDER
VALVE
DIVIDER
VALVE
TI11103
• If all indicator port plugs are removed, the master will
not cycle. Blockage is in this divider valve.
• When indicator port plug of a blocked area is
removed, a small shot of trapped lubricant will usu-
ally surge out of this outlet as the inlet pressure on
the divider valve drops.
• If testing (Step 4) indicates a blockage in the master
divider valve, this divider valve must be disassem-
bled and cleaned. See Clean Divider Valve, Step 7,
page 13.
FIG. 12
TI11104
HAND PUMP
SYSTEM PUMP
MASTER
DIVDER
VALVE
SECONDARY
DIVIDER
VALVE
LUBE
OUTLETS
INDICATOR
PORT
PLUGS
REMOVED

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