Service manual

PN 4237242C
4.22-2
SERVICE AND REPAIR PROCEDURES
PERISTALTIC PUMP MOTOR AND SPOOL
3. Remove the Peristaltic Pump Assembly from the lower chassis. It is held in place with
six Phillips-head screws (Figure 4.22-1). There should be enough play in the tubing and
wiring to allow work on the assembly without disconnecting it.
4. Remove the peristaltic tubing from the pump (Figure 4.22-1).
5. Remove the tubing spool from the motor shaft (Figure 4.22-1). This spool is fastened
with two HEX-head setscrews that tighten against the shaft. If you are replacing the
motor, this step could be performed after you remove the motor, since the opening in the
mounting plate will allow the spool through. If you are replacing the spool, go to
Installation, step 3, below.
6. Disconnect the electrical connector at the back of the motor you wish to replace.
7. Disconnect the four Phillips-head screws with nuts (Figure 4.22-1) and remove the
motor.
Installation
1. Make sure the replacement motor has a wear plate and a rubber seal. The wear plate is
attached to the motor with black RTV compound and the rubber seal is installed concave
end toward the wear plate and lubricated with DOW CORNING 33 Lubricant.
2. Attach the motor using the four Phillips-head screws and nuts (Figure 4.22-1).
3. Attach the tubing spool if it has not already been attached (Figure 4.22-1). The tubing
spool is fastened to the motor shaft using two HEX-head setscrews that must line up
with the flattened portion of the motor shaft. The spool is pushed onto the shaft as far as
it will go.
4. Attach the Peristaltic Pump Assembly to the lower chassis using six Phillips-head screws
(Figure 4.22-1).
5. Reconnect any motors that were disconnected.
6. Install the diluent reservoir door onto the lower chassis (Figure 4.22-1).
7. Connect the diluent level sensor and wind the peristaltic tubing onto the pump spool.
8. Turn ON the instrument’s power.
Verification
1. Verify the operation of the peristaltic pumps:
a. From the Main Menu, select
5 SPECIAL FUNCTIONS tt 3 DILUTER FUNCTIONS.
b. Select
4 RINSE
to check
PM3.
c. Select
3 DRAIN to check PM4.
d. Select
5 MIX
to check PM1.
e. Select 4 RINSE several times, until reservoir must refill, to check PM2.
2. Perform an SVP (Heading 5.1).