Ditch Witch JT922 - Manual (Page 148)

JT922 Operator’s Manual
Service - 147
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
1. Pump MPG into fitting (A) until the length of the
compressed spring, dimension (B), is 15.25”
(387.35 mm).
2. Drive straight forward one machine length and
check tension again.
Change Air Filter
To change:
1. Remove air filter cover (4) and remove primary
(3) and secondary (2) elements.
2. Wipe inside of housing (1) and wash cover.
3. Insert new elements.
4. Replace cover with dust evacuator valve at the
6 o’clock position.
5. Reset air filter service indicator.
Check Saver Sub
Check saver sub and replace as needed. See your
Ditch Witch dealer for replacement parts.
To replace
1. Remove eight bolts (shown) that attach saver
sub to spindle. Do not remove indexing dowels
from spindle.
2. Remove and replace o-ring, if necessary.
3. Install in reverse order and tighten eight bolts in a cross pattern to 55 ft•lb (74.6 N•m). Apply Loctite
®
242 to bolts before installation.
Note: Saver sub must mate up to every drill
pipe. Check sub for thread wear. If saver sub
threads are more worn than pipe threads, saver
sub is damaging the drill pipe.