SERVICE TRAINING
Service Manual 5
Rock Valve
zerks.epsL
Grease Zerk #1,2,3,4
Grease Zerk #5
Grease Zerk #6
Grease Zerk #7
Grease Zerk #8
Rock Valve Lubrication
Points
If your unit is not equipped with an auto-lube,
grease your agitator bearings. There is one zerk
on each side of the hopper. Grease every 200 or
300 yards, as the pour allows.
Grease your agitator bearings. There is one zerk
on each side of the hopper. Re-grease every two
or three hundred yards, as the pour allows.
NOTE!
You don’t grease agitator bearings like
you grease most other bearings. That is, if you
normally pump in grease until you see it squirt-
ing out somewhere, you will ruin your agitator
seals. When you grease the agitator bearings,
watch the rubber grease cones that are located
inside the hopper. You want the cones to bulge
out slightly because they are full of grease, but
you don’t want to have the grease come out
around the shaft, because where the grease
comes out concrete will be able to go in. Once
concrete makes it inside of the grease cone, you
will quickly wear out the bearings. When re-
greasing after the hopper is full of concrete and
you can no longer see the cones, just give the
zerks a couple of squirts. This is one of the few
times when it is better to under grease than to
over grease.
Grease the rock valve lubrication points before
the pour begins. Once you start pumping, grease
them every couple of hours. There are six zerks
to grease for the rock valve, plus the two for the
agitator.
If your unit is equipped with an auto-lube, greas-
ing is accomplished automatically. The grease
timers in the cab must be adjusted to assure
proper grease flow from each feeder. Check with
SAI’s Service Department for timer adjustment
instructions. The timers are usually mounted on
the top of the doghouse between the seats.
