4000 SRM 764 Two-Stage Mast
WARNING
Never replace j
ust the worn section of a chain.
Replace the com
plete chain. Never replace just
one chain of a c
hain pair. Replace both chains.
3. For chains tha
t can be used again, put the chains
in SAE 30 oil fo
r12hours.
4. Inspect the chain anchors and pins. Replace
chain anchors that have broken fingers or holes
worn so that they are not round. Replace chain
anchor pins that are worn or have cracks.
NOTE: THE INSTRUCTIONS FOR MEASURING CHAIN WEAR ARE SHOWN ON THE CHAIN WEAR SCALE.
Pitch
Total Lengths of 20 Links
(Pitch) of New Chain
Wear Limit
The Maximum Length of
20 Links
12.7 mm (0.50 in.)
15.9 mm (0.625 in.)
19.1 mm (0.75 in.)
25.4 mm (1.00 in.)
31.8 mm (1.25 in.)
44.5 mm (1.75 in.)
50.8 mm (2.00 in.)
254.0 mm (10.0 in.)
317.5 mm (12.5 in.)
381.0 mm (15.0 in.)
508.0 mm (20.0 in.)
635.0 mm (25.0 in.)
889.0 mm (35.0 in.)
1016.0 mm (40.0 in.)
261.6 mm (10.3 in.)
327.0 mm (12.87 in.)
392.4 mm (15.45 in.)
523.25 mm (20.6 in.)
654.1 mm (25.75 in.)
915.7 mm (36.05 in.)
1046.5 mm (41.2 in.)
1. WORN PIN
2. CRACKS
3. EDGE WEAR
4. HOLE WEAR
5. LOOSE LEAVES
6. DAMAGED PIN
7. CORROSION
8. CHAIN WEAR SCALE
Figure 5. Chain Parts and Wear
9
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