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Service manual

ManualsBrandsCitizen ManualsComputer equipmentGSX-190
151152153154155156157158159160
PN 4237242C
4.21-3
SERVICE AND REPAIR PROCEDURES
SYRINGE ASSEMBLY
4
12. Free the syringe lead screw assemblies (Figure 4.21-1):
a. Remove the two screws fastening the upper mounting plate to the top of the front
plate.
b. Remove the two screws fastening the syringe guide rods to the upper mounting
plate.
c. Remove the upper mounting plate with manifolds and sensors still attached.
ATTENTION: There are two spacers and one spring for each syringe. Do not lose them, they are
critical to syringe operation.
13. Remove the hardware at the top of each syringe and set aside.
14. Remove the belt from the motor gear first, then the lead screw gear. There will be enough
play in the motor assembly and lead screw assembly to work it off.
15. If the lead screw assembly is to be replaced, loosen the two screws that fasten the front
plate to the lower mounting plate (Figure 4.21-1). This will allow the lead screw
assembly to be pulled up and away from the Syringe Assembly.
16. Remove the lower bearing, spacer and gear from the bottom of the lead screw
(Figure 4.21-1).
17. Remove the syringe plunger mounting bracket from the lead screw assembly.
Installation
1. Install the syringe plunger mounting bracket, lead screw gear, spacer and lower bearing
onto the replacement lead screw assembly (Figure 4.21-1):
ATTENTION: The thickness of the spacer is very important. If it is lost, replace it with the
proper part.
r Push the gear onto the lead screw as far as it will go.
r Before tightening the setscrews, tighten one against the flat part of the lead screw
shaft.
r Before tightening the screws, use LOCTITE 242 THREADLOCKE2 on the
Phillips-head screw that fastens the bearing to the lead screw.
2. If the motor had been removed, install the motor at this time. Do not tighten the motor
in place yet, it is used to adjust belt tension.
3. Install the replacement lead screw assembly into the Syringe Assembly. Do not fasten yet.
4. Install the drive belt by putting the belt around the lead screw gear first, then around the
motor gear.