Multiquip MG30M2D - Manual (Page 53)

MAYCO MG-30 PUMP — OPERATION AND PARTS MANUAL — REV. #3 (09/15/11) — PAGE 53
MG-30 PUMP — MAINTENANCE (PUMP)
RUBBER CHECK BALL
The brass cap and rubber ball should be removed and all parts
cleaned daily . Setup of materials will have an affect on the
pressure rating of the brass cap, causing the rubber ball to eject
at an incorrect pressure.
Inspect the rubber relief ball every day before reassembling it
back into the valve. The ball is subject to wear and possible
age hardening .
If the ball is cracked, has flat spots due to wear, pieces broken off
of it or out of round,
replace the rubber ball immediately .
To check the rubber ball for age hardening, conduct the
"
bounce " inspection test.
1. Hold the rubber ball in hand 5 feet above a concrete floor.
2. Drop the ball (DO NOT throw the ball downward), simply
release the ball from your hand.
3. First bounce must be 18-inches minimum.
Replace the rubber ball immediately
if it does not pass visual inspection or
the bounce test. DO NOT use a rubber
ball that is defective or worn. When
ordering replacement rubber ball use
Mayco P/N EM400581
Failure to properly maintain this
pressure relief valve will create a
dangerous situation of over
pressurizing the pump and delivery.
NOTE
LEATHER PISTON CUPS
The leather piston cups out wear the rubber balls. The leather
cups as well as the rubber balls can have premature wear if
exposed to excessive pumping pressures or jamming of the
pump.
The leather cups are a natural wear component and will require
periodic replacement. The life of the leather cups depends on
many factors, proper lubrication, oil cleanliness, abrasivness of
sand and material.
When the leather cup on the pump side is damaged, it may suck
air on the suction stroke instead of a full charge of material from
the hopper. When this condition occurs, material flow will
decrease.
NOTE
Rubber Check Plug
The rubber safety plug should be removed and cleaned daily .
Replace this plug if it is defective or worn. See manifold assembly
in this manual when ordering replacement rubber plug.
NOTE
When replacing either the rubber or
steel check ball, remember that there
is another check ball that should be
inspected for wear or damage.
Always
check both check balls. Make sure all
gasket parts are clean when they are
reassembled.
NOTE
To ensure maximum cup life, the oil in
the reservoir must be maintained at the
proper level. In addition the lubrication
box must be cleaned periodically. There
are two clean-out ports located at the
bottom of the lubrication box. Any questions regarding the
lubrication clean-out procedure, contact the MAYCO
Service
Department.
CHANGING THE LEATHER PISTON CUPS
1. Run the piston to the end of its stroke.
2
Remove pump unit.
3. Loosen piston rod nut.
4. Rock piston assembly by hand turning drive belt.
5. Pull cylinder out exposing piston assembly.
6. Remove piston nut.
7. Slide piston assembly off piston rod.
8. Check all washers for damage.
9. Replace any component that shows is worn or is
damaged.
10. Check neoprene leather cup expander.
11. Check leather cup and saturate with oil before replacing.
12. Check both felt cam oiler pads for oil saturation, If dry
saturate each pad with SAE 30 motor oil.
13. Reinstall piston parts in the reverse order that they were
dis-assembled. Make sure that the piston oiler hose is
at the top of the piston and remains there while the piston
rod nut is being tighten.
14. Remember lubrication of the piston depends on gravity
flow from the oil reservoir to the cam oiler pads.
As the leather cups wear, fine cement particles will accumulate
in the bottom of the librication box. Once the cement past reaches
1-inch in height, it is recommended that the lubrication box be
drained (flushed) and cleaned