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C. E. Niehoff & Co.
BRUSHLESS ALTERNATORS
A4-106 Tension Link
Drive Belt Tension Adjuster
for 600 Series Alternator on
Detroit Diesel Series 60 Engines
Installation Instructions
CAUTION
minor property damage.
These instructions will cover installation of
A4-106 tension link (drive belt tension adjuster)
for use with 600 series alternators installed on
Detroit Diesel Series 60 engines used in select
fire service applications.
Review Figure 1 to familiarize yourself with
arrangement of tension link and basic layout of
assembly. Tension plate mounting holes are
identified by number on drawing and in steps
that follow.
Installation steps are as follows:
1. Release tension on alternator drive belt by
loosening alternator attaching hardware on
present tension link and alternator mounting lugs (feet).
2. Remove drive belt from alternator pulley.
This symbol is used to indicate
presence of hazards that can cause
3. Remove mounting hardware from both ends
of present tension link and remove tension
link.
CAUTION
mounting lugs and impact mounting bracket or
engine. Damage to mounting lugs or alternator
may occur.
4. Using holes #1 and #2, mount tension plate
(triangular bracket) on gear case cover of
engine using 7/16” Grade 8 or M10, Class
10.9, bolts long enough to pass through
tension plate and engine gear case cover.
Note: Bolt used in hole #1 will be 3/8” longer
than original engine bolt to allow for thickness of tension plate or approximately 4-1/2”
long. Bolt used in hole #2 will be ¾” longer
than original engine bolt to allow for thickness of tension plate and thickness of the
slotted end of the tension link or approximately 5-1/4” long.
Remove slack in #1 bolt but do not torque
bolt at this time.
Do not allow unsupported
alternator to swing down on
Trunnion
(hardware provided
in kit)
Û
Hardened washer
from kit
Û
Û
2
Tension link
Bolt, washer
and locknut
provided in kit
Û
3
1
Û
Tension plate
(bracket)
Figure 1 - A4-106 Tension Link Assembly Installed on Alternator
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5. Place hardened washer provided in kit on
bolt that will be used in hole #2 of tension
plate. Install bolt with hardened washer
through hole #2 in bracket and through gear
case cover. Place nut on bolt but do not
remove any slack until tension link is installed. Bolt in hole #2 should be loose
enough to allow for insertion of slotted end of
tension link.
6. Install nut, lock washer, flat washer, trunnion, flat washer, lock washer and nut on
threaded portion of tension link.
7. Attach new tension link to tension plate by
first sliding slotted end of tension link between hardened washer and tension plate at
hole #2 on tension plate. Install provided ½13x1.5in USS bolt through hole in tension
link and hole #3 of tension plate. Secure with
provided washer and locknut. See drawing.
Remove slack in all attaching fateners but do
not torque fasteners at this time.
8. Rotate alternator into position and place
drive belt on alternator pulley.
9. Place trunnion on tension link over threaded
hole in control housing of alternator and
install provided ½-13x2.0” USS bolt,
lockwasher and washer through trunnion
and into housing of alternator.
Remove slack in attaching fastener but do
not torque fastener at this time.
10. Adjust alternator drive belt tension to vehicle
manufacturer’s specification by adjusting
nuts on each side of trunnion.
11. Lock trunnion in place by torquing trunnion
adjustment nuts to 50lb.ft.
12. Torque all mounting fasteners at this time.
Tension plate to gear case cover, per engine
manufacturer’s specification. Tension link to
bracket: 50lb.ft.
Tension trunnion to alternator drive end
housing: 50lb.ft.
Alternator mounting lugs (feet) to vehicle
manufacturer’s specification.
13. Operate engine and observe alternator
operation.
14. Re-tension alternator drive belt as necessary.
C. E. Niehoff & Co. • 2021 Lee Street • Evanston, IL 60202 Tech Services Hotline 800-643-4633
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