6: Maintenance
ShopTek™ ST4, ST5, ST7, ST11, ST15 Three-phase 60 Hz User Manual
88292018-236 R00
50
Subject to EAR, ECCN EAR99 and related export control restrictions.
6.9
Replacement and alignment of
belt pulleys
In the event of the motor or compressor unit having been
removed and replaced, pulley alignment will have to be
checked and adjusted.
Misalignment of pulleys can cause rapid wear of the V-belt
form, considerably shortening the service life of both belts
and pulleys. Due to Sullair’s innovative design, only paral-
lel alignment of the drive pulleys needs to be checked.
Parallel alignment can be checked by two methods.
1. Placing a straight edge against the pulleys
near their centers. For correct alignment, the
straight edge must be sitting flat against both
pulleys, i.e. full face contact. There should be
no more than 0.5 mm misalignment.
2. Using a laser, ensure misalignment is no
greater than 0.5°.
To correct parallel misalignment, first check that the rear
face of the compressor unit pulley is positioned 0.3 in
(7.5 mm) off the mounting face. This is required to ensure
that the belts clear all mounting bolt heads. With the com-
pressor unit pulley correctly positioned, move the motor
pulley on the shaft to achieve correct alignment.
6.9.1
Instructions for installing a pulley
1. Clean all surfaces of shaft, pulley and taper
lock bushing.
2. Fit taper lock bushing inside pulley.
3. Spray oil or anti-seize compound on the grub
screw threads and gently screw in.
4. Slide the pulley/bushing assembly on to the
shaft to the correct position, aligning the key-
way.
5. Tighten the grub screws in stages to the
specification in
.
6. Check pulley alignment.
7. Install belts and tension as outlined in the
belt tensioning procedure.
8. Run machine for ½ to 1 hour and check the
tightening torque of the grub screws. Tighten
if necessary;
6.9.2
Instructions for removing a pulley
1. Loosen and remove both grub screws.
2. Install one grub screw into the jacking/disas-
sembly hole. Refer to
.
3. Tighten grub screw to release taper lock hub
from pulley.
4. Slide pulley and bushing from shaft.
6.10 Hose maintenance
Fluid and air hose replacement is recommended after
two (2) years.
6.11 Tank mount package
maintenance
Receiver tank should be drained daily. Change SCF fil-
ters when indicated by gauge on housing. Refer to dryer
documentation for maintenance requirements.
Table 6-2: Pulley tightening torque specification
Tapered hub
Size of
Hex Key
(mm)
Number
of grub
screws
Tightening torque
ft lbs
N m
1210/1610
5
2
14.8
20.0
2012
6
2
22.1
30.0
Figure 6-12: Diagram of belt pulley and taper lock
bushing assembly
1. Jacking/disassembly hole
2. Installation hole
