User's Manual

10-1
42000Modu-Flo
®
System
R
OPERATION AND
SERVICE INSTRUCTIONS
Modu–Flo®
System
SECTION 10
TROUBLESHOOTING
10.1 GENERAL ............................................................... 10-1
10.1 GENERAL
10.1.1 Many system problems may be caused by loose
connections or air trapped in the system. Before removing
system components, it is a good practice to check all
connections to make sure they are tight. Also make sure the
system is properly bled. Table 10-1 lists some of the
problems which may occur in the Modu-Flo system along
with possible causes and corrective actions. Disassembly
and assembly procedures for the system components are
contained in other sections of this manual and should be
referred to if a component needs servicing.
Table 10-1. Modu-Flo Troubleshooting
Problem Possible Cause Corrective Action
A. No lube is dispensed 1. Reservoir or tank is empty. 1. Refill as required.
from pump, but pump is
receiving air or hydraulic 2. Air or hydraulic pressure is inadequate. 2. Set pressure to proper setting.
operating signals.
3. If pump is single-acting, return 3. Replace spring or change pump
spring may be defective. to double-acting. (Refer to Section 3.)
4. Pump needs servicing. 4. Disassemble pump and replace
defective components. (Refer to Section 3.)
5. Pump adjustment screw is turned in 5. Adjust pump. (Refer to Section 3.)
too far.
6. Pump is air bound. 6. Bleed air through test port. (Refer to
Figure 4-1).
B. Blow-out disc has ruptured. 1. High pressure exists in the system. 1. Inspect dividers, lines, fittings, and lube
points to determine the source of high pres-
sure. Correct problem and replace disc.
2. Excessive air or hydraulic flow to pump. 2. Install a restrictor in the air or hydraulic
lines.
C. Pump output is erratic. 1. System is not properly bled. 1. Bleed system.
2. Pump needs servicing. 2. Disassemble pump and replace
defective components. (Refer to Section 3.)
3. Pump adjustment assembly is leaking 3. Tighten components of the adjustment
or sucking air during return stroke. assembly.
4. Defective o-ring. 4. Repair pump or manifold. (Refer to
Sections 3 and 4.)
5. Setscrew and ball are loose in TEST 5. Tighten setscrew.
port.