PAGE 36 — MAYCO C30HDGA CONCRETE PUMP • OPERATION MANUAL — REV. #1 (09/09/19)
MAINTENANCE
V-BELT AND DRIVE CHAIN ADJUSTMENT
1. Loosen the pillow bearing bolts (Figure 25) only to the
point where the bolts will remain snug.
2. Unlock the two pusher bolt lock nuts.
3. Turn each pusher bolt clockwise an equal amount until
the chain is to proper adjustment of approximately 3/8
to 1/2 in. slack in the chain. It is very important that the
pulley side and the chain side (pillow block bearings)
are within 1/16” of an equal distance.
4. This distance can be checked by using a tape measure
or a straight edge ruler, measuring from the inside of
the pusher bolt bracket to the face of the pillow block
bearing.
5. The drive chain should be adjusted regularly to
remove all slack. Once all slack is removed, DO NOT
over-adjust, as this will overload the shaft bearings. A
slack chain on the crank drive creates backlash and
shock loads on the shafts and bearings which results
in shorter wear/life of the drive components.
6. Lubricate the chain regularly. It is advisable to carry
a spare chain and master links for replacement in the
field if necessary.
7. Drive belts should be regularly adjusted to prevent
slippage. To adjust the belts, loosen the engine
mounting bolts and move the engine until there is a
maximum 3/4 in. deflection in the belts, retighten the
engine mounting bolts.
8. Frequent inspections should be made on all drive
components to make certain that all bolts and nuts
remain tight.
NOTICE
Prior to adjusting the chain, place the lobe of the cam
in the down position. The chain should have 83 rivets,
Including one each, half-link and full-link.
Figure 25. V-Belt and Drive Chain Adjustment
