Service Manual Manual

18 Maintenance Basics – Tube

Frozen rollers in roller assembly (wear part)

Chemical intrusion.

A cracked pump head housing

Wear, chemical exposure, or incompatibility.

Corrective Action

Pump head housing and roller assembly must be cleaned

and wiped free of chemical residue or replaced if corroded

or cracked. Rollers need to turn freely but without

rocking/tilting from side to side.

2. Replace roller assembly and/or cracked housing.

NOTE Additional information

Normal r

oller wear can cause a lack of output as a

result of the rollers’ inability to fully squeeze the

tube

. The wear is generally in the bore of the roller. To

check for roller bore wear, hold each roller (at the top

and bottom) between y

our thumb and index finger

. If it

rocks back and forth, replace the roller assembly.