KNIGHT SMART CART OPERATION MANUAL
SECTION 4
MAINTENANCE
17
B. Linked Chain Gauge Replacement Measurement for 4mm and
5mm Linked Load Chains
1. Determine which type of linked chain is being inspected, either
4mm or 5mm, by placing a single link into the chain gauge where the
arrows are located. (Refer to Figure 4-2)
2. Raise the cart to the full up position and mark the chain.
3. Lower the cart to the full down position.
4. Select 13 links starting with the link that was marked in step 2.
5. The 13-selected links should fit loosely onto gauge prongs as shown
below. If links number 1 and 13 do not fit onto prongs or have to be
forced into selection, replace the load chain. This length has stretched
2% or more and should be removed from service and replaced with
new chain.
6. Perform this inspection in multiple sections of the chain working up to the
sprocket.
Figure 4-2
C. If Chain Gauge is Not Available
•
Select an unworn, un-stretched length of the load chain.
•
Suspend the chain vertically under tension. Use a caliper type gauge to
measure the accumulated pitch of between 5 and 13 links.
•
Measure the same number of links throughout the used chain and
calculate the percentage increase in length.
•
The chain should be replaced if the gauge length measured over any
5, 7, 9, 11, or 13 links as appropriate exceeds that of the unused chain
by 2%.
