Echo 74065S - Manual (Page 11)

9
Maintenance is essential in preserving engine life. The engine
should be cleaned periodically to remove grass and buildup. The
engine owners manual addresses cleaning the air filter and
changing the oil. Service engine according to the maintenance
schedule in your engine owners manual.
9. Replace the handle support channel (back cover with
handlebar adjustment tabs). The bolts should be secured with
the bolt head beneath and the nuts and washer above the
trimmer body.
IMPORTANT: Clean grass and buildup from the
engine periodically. Dusty conditions will require
frequent cleaning.
Engine Maintenance
1. Shut off the engine. Disconnect the spark plug wire.
2. Remove o-ring. Refer to Figure 14.
3. Remove debris filter from filter base.
4. Clean debris filter or replace if needed.
5. Reinstall debris filter by performing above steps in reverse
order.
Debris Filter Cleaning/Replacement (Model 73050,
73150, & 74050
Figure 14
O-Ring
Debris Filter
Debris Filter
Base
Inspect and clean engine cooling fins if needed.
Service & Maintenance-Cont.
Check the condition of the drive belt annually or after 30
hours of operation, whichever comes first. If the belts are
cracked, frayed, or worn, replace them by following the
steps below.
Belt Replacement Requirements:
• One (1) 1/2” wrench or one (1) 1/2” socket/ ratchet
1. Shut off the engine. Disconnect the spark plug wire.
2. Remove the front cover weldment (requires loosening and
removing three bolts).
3. Loosen the four bolts fastening the spindle hub to the trimmer
bottom frame. This will allow the spindle hub with the attached
trimmer pulley to move freely.
4. Remove the handle support channel (back cover with tabs to adjust
the handlebar). Requires loosening and removing four bolts.
5. Remove worn or broken belt. If the belt is badly worn and will not
be used again, cut for ease in removal.
6. Install new belt from the front to the back. Feed belt above the
front trimmer pulley and below the rear pulley. On Model 73150,
position belt on the outside of the center pulley.
7. Move the spindle hub by inserting a screwdriver in the slot on the
rear side of the spindle hub and applying 70 lbs. pressure forward
until belt is tight. Tighten bolts.
Belt Replacement Steps:
Drive Belt Checking and Replacement
Model 73150 Chain Adjustment
1. Loosen two (2) 5/16” nuts located under the trimmer axle.
2. Slide the trimmer axle back to tighten the chains. Slide the
trimmer forward to loosen the chains.
3. Retighten 5/16” nuts.
8. Replace front cover and secure with bolts.