JT520 Operator’s Manual Service - 137
As Needed
CMW
Check Track Tension and Condition
Check track tension and condition and adjust or
replace as needed. See your Ditch Witch dealer for
replacement parts.
To adjust, turn bolt (1) clockwise to tighten and
counterclockwise to loosen. Track tension is correct
when metal piece is exactly in the middle of cut out
window (2).
Adjust Thrust Chain Tension
Adjust thrust chain tension as needed.
1. Remove all pipe from pipe box.
2. Move carriage to front of frame.
3. Loosen jam nut (shown).
4. Turn adjuster bolt clockwise to tighten and
counterclockwise to loosen chain. Chain is
properly adjusted when bottom of chain is 3/8-
1/2” (9-13 mm) above frame.
5. Tighten jam nut after adjusting.
Replace Fan Belt
Replace belt as needed.
1. Loosen two alternator bolts (shown).
2. Adjust position to allow belt to slip off.
3. Install new belt.
4. Adjust position to tighten belt.
5. Tighten bolts.
6. Check tension.
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