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4 MM
SCREW
4 MM SCREW
MAINTENANCE (ENGINE/MIXER)
SPARK ARRESTER CLEANING (300 HOURS)
Clean the spark arrester once a year or 300 hours.
1. Remove the 4 mm screw (3) from the exhaust deflector
(Figure 31), then remove the deflector.
BALL SOCKET AND CLAMP FACE
1. If the towing vehicle is equipped with a ball socket
(Figure 33), smear socket periodically with multi-
purpose grease.
This will keep the ball socket well lubricated.
BALL
SOCKET
PROTECTOR
5 MM SCREW
MUFFLER
5 MM
SCREW
MULTI-PURPOSE
GREASE
SPARK
ARRESTOR
Figure 31. Spark Arrester
2. Remove the 5 mm screw (4) from the muffler protector, then remove the muffler protector.
3. Carefully remove carbon deposits from the spark
arrester screen (Figure 32) with a wire brush
WIRE BRUSH
Figure 33. Ball Socket
2. Periodically oil pivot points and clamp face surfaces of coupler with SAE 30 WT. motor oil.
3. When parking or storing your mixer, keep the coupler off the ground so dirt will not build up in the ball socket.
GREASE FITTINGS (ZERK) - MIXER
1. There are four
grease (Figure 34) fittings that will
require lubrication. Lubricate these fittings once a week . Use lithium base grease, grade N0.1.
SPARK ARRESTOR
SCREEN
Figure 32. Cleaning The Spark Arrester
4. If the spark arrester is damaged and has breaks or holes, replace with a new one.
5. Reinstall the spark arrester and muffler protector in reverse order of disassembly.
GREASE
FITTING
GREASE
FITTING
CAP
Figure 34. Grease Fittings (Mixer)
MC94SK/PK CONCRETE MIXER • OPERATION MANUAL — REV. #0 (06/22/22) — PAGE 27
WHEEL BEARINGS
1. After every 3 months of operation, remove the hub
dust cap and inspect the wheel bearings (Figure 35).
Once a year, or when required, disassemble the wheel hubs remove the old grease and repack the bearings forcing grease between rollers, cone and cage with a good grade of high speed wheel bearing grease (never use grease heavier than 265 A.S.T.M. penetration
(“No. 2.”).
OIL SEAL
CONE BEARING
MAINTENANCE (MIXER)
4. At the end of each day’s operation, place mixer drum in an upright position and spray inside of tub immediately with water to prevent lumps of dried mortar or plaster from forming and contamination of future batches.
5. DO NOT allow a buildup of materials to form on the blades or anywhere inside the drum.
6. Rotate mixer to dump position and remove debris.
7. Thoroughly clean the entire mixer, wheels, cabinet and frame.
8. NEVER!
pour or spray water over the engine
CONE
BEARING
BEARING
CUP
BEARING
CUP
Figure 35. Wheel Hub and Bearings
2. Fill the wheel hub (Figure 35) with grease to the inside
diameter of the outer races and also fill the hub grease cap. Reassemble the hub and mount the wheel. Then tighten the adjusting nut, at the same time turn the wheel in both directions, until there is a slight bind to be sure all the bearing surfaces are in contact.
Then back-off the adjusting nut 1/6 to 1/4 turn or to the nearest locking hole or sufficiently to allow the wheel to rotate freely within limits of .001” to .010” end play.
Lock the nut at this position. Install the cotter pin and dust cap, and tighten all hardware.
MIXER CLEANING
It is important that the drum interior is free of dried material.
Obstructions can cause the paddle blades to lock against the drum.
1. Push the “Engine Stop” button inward to the OFF position to the stop the engine.
2. ALWAYS disconnect the spark plug wire before cleaning the inside of the drum.
3. Place “DO NOT Operate” tag on mixer.
Figure 36. No Spraying of Water
9. When cleaning of the entire mixer is done, return mixing drum to an upright position.
TIRES/WHEELS/LUG NUTS
Tires and wheels are a very important and critical components of the trailer. When specifying or replacing the trailer wheels, it is important the wheels, tires and axle are properly matched.
WARNING
DO NOT attempt to repair or modify a wheel.
DO NOT install an inter-tube to correct a leak through the rim. If the rim is cracked, the air pressure in the inter-tube may cause pieces of the rim to explode (break-off) with great force and can cause serious eye or bodily injury.
PAGE 28 — MC94SK/PK CONCRETE MIXER • OPERATION MANUAL — REV. #0 (06/22/22)
TIRES WEAR/INFLATION
Tire inflation pressure is the most important factor in tire life. Pressure should be checked cold before operation.
DO NOT bleed air from tires when they are hot. Check inflation pressure weekly during use to insure the maximum tire life and tread wear.
WARNING
ALWAYS wear safety glasses when removing or installing force fitted parts. Failure to comply may result in serious injury.
Table 8 (Tire Wear Troubleshooting) will help pinpoint the
causes and solutions of tire wear problems.
Table 8. Tire Wear Troubleshooting
Wear Pattern Cause Solution
Center
Wear
Over Infl ation
Adjust pressure to particular load per tire manufacturer
Edge
Wear
Under
Infl ation
Side
Wear
Loss of chamber or overloading
Adjust pressure to particular load per tire manufacturer.
Make sure load does not exceed axle rating. Align wheels.
Toe
Wear
Incorrect toe-in
Align wheels.
Flat
Spots
Check bearing adjustment and balance tires.
Wheel lockup and tire skidding
Avoid sudden stops when possible and adjust brakes.
MAINTENANCE (MIXER)
SUSPENSION
The spring suspension and associated components (Figure 37)
should be visually inspected every 6,000 miles for signs of excessive wear, elongation of bolt holes and loosening of mounting bracket. Replace any damaged suspension component immediately.
Figure 37. Suspension Components
LUG NUT TORQUE REQUIREMENTS
It is extremely important to apply and maintain proper wheel mounting torque. Be sure to use only the fasteners matched to the cone angle of the wheel. Proper procedure for attachment of the wheels is as follows:
1. Start all wheel lug nuts by hand.
2. Torque all lug nuts in sequence. See Figure 38.
DO NOT torque the wheel lug nuts all the way down. Tighten
(torque) each lug nut in three separate passes as defined
NOTICE
NEVER use an pneumatic air gun to tighten wheel lug nuts.
MC94SK/PK CONCRETE MIXER • OPERATION MANUAL — REV. #0 (06/22/22) — PAGE 29
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