Troubleshooting Guide - Haskel 1/3 HP Serie Technische- Und Leistungsdaten

Air Drive Section
The air piston has a spring return. Care should be taken when dismantling to prevent the spring from
causing the top cap to fly off. The most common cause of air drive malfunction is O-ring 568011-21 on the
end of spool 17157. Inspect this first and replace if necessary prior to retesting before further disassembly
of air drive. Spool 17157 is most easily removed by removing the muffler upper cap and carefully opening
the air drive valve to push the spool and sleeve assembly out with compressed air. The spool and sleeve
can be contained by holding a cloth over the exhaust port. The air piston, air barrel, cycling valve and
sleeve should be re-lubricated on assembly with Haskel Silicone Grease P/N 50866. Torque the tie rod
nuts evenly to 50 in-lbs.
Hydraulic Section
If dismantled for inspection and parts replacement use following torque values on re-assembly:
Assembly
Inlet check valve, ratios -7, -12
Inlet check valve, ratios -21, -36
Inlet check valve, ratios -71, -110, -188
Outlet check valves, all ratios
When ordering spare parts advise pump serial no., model no., spare part no., and description.

Troubleshooting Guide

Pump will not cycle, pump bypasses air
•
Inadequate air
a. See comments on: Air drive systems, page 2 and air drive section, on this page.
•
Contaminated air system
b. Remove sleeve and cycling spool (under upper cap of muffler). Clean, inspect and lubricate with
Haskel Lubricant 28442.
False cycle, leak from pilot exhaust (top center of cap).
•
Leakage of pilot system.
c. Install new air section seal kit.
Pump cycles without pumping or does not stall.
•
Check valve(s) not seating or leak in system.
d. Inspect check valve(s). First inlet check and then outlet check.
Pump fluid appears at muffler (or vent port on separation models).
•
High pressure seal leakage.
e. Install new liquid section seal kit.
1/3 HP Pump Series • MLP-20/46F
Torque Value
to 95 ft-lbs.
to 50 ft-lbs.
to 125 ft-lbs.
to 50 ft-lbs, except -220 is 75 ft-lbs.
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