Troy-Bilt 52070, 52066 Belt Performance Troubleshooting, Lubrication, Cleaning the Engine

Section 5: Maintenance 15

WARNING

Before inspecting, cleaning or servicing the machine, shut off engine, wait for all moving parts to come to a complete stop, disconnect spark plug wire and move wire away from spark plug. Remove ignition key on electric start models.

Failure to follow these instructions can result in serious personal injury or property damage.

BELT PERFORMANCE

TROUBLESHOOTING

Poor belt performance (noise, overheating, cracking, etc.), can be caused by several conditions. Follow the steps below to cor- rect belt performance problems. Also use these checks after installing a new belt. After shutting the engine off and discon- necting the spark plug wire, remove the rear belt cover on the underside of the machine (refer to previous page). Release the Trimmer Head Control Bail to remove all belt tension.

1 – Belt must be routed between pulleys and guides.

Examine inside surface of belt. If it is cracked or peeling, unbolt and lower the spindle mounting plate and proceed with this step. The pulley system has two belt guides (see Figures 5-7 and 5-8) – the belt must run between the pulleys and the guides. If it doesn’t, reroute it as shown. Use masking tape to temporarily hold the belt in place while reattaching the spindle mounting plate.

2 – Minimum clearance is 1/4" on each side between rear belt guide and pulley.

If the rear belt guide (Figure 5-8) is less than 1/4" from the sides of the pulley when the Trimmer Head Control Bail is engaged, loosen the belt guide hardware and move the guide to create a clearance of at least 1/4". Tighten the hardware securely.

3– Both idler pulleys must be mounted right-side up.

Check that the two idler pulleys shown in Figure 5-9 are correctly installed – note that the longer hub on each pulley is against the idler arm. If the pulleys are upside-down, turn them over and tighten them securely.

Spindle Mounting Plate

Front Pulley

Belt Guide

Brake

Place

Tape Here

Figure 5-7

Rear

Pulley

Belt

Guide

Minimum
1/4" Gap
Figure 5-8
Idler Arm
Idler Pulley	Idler Pulley
Longer Hub
Figure 5-9

LUBRICATION

Apply light oil or a silicone-based lubricant to the following locations:

•Throttle control cable

•Control bail cable

•Nuts, bolts and other hardware

NOTE: The spindle head is permanently lubricated at the factory. There is no need for additional lubrication.

CLEANING THE ENGINE

Before each use of the machine and at each refueling, clean grass, chaff or accu- mulated debris from the finger guard area (A, Figure 5-10) on top of the engine, and from the linkage, springs and controls on the engine. Keep the area around and behind the muffler free of any combustible debris. See “Cleaning Debris” in the Engine Owner’s Manual for complete cleaning instructions. Do not use water to clean engine parts as water could contam- inate the fuel system. Use a brush or dry cloth. Be sure engine is cool before clean- ing around muffler area.

NOTE: The separate engine air cleaner must also be serviced according to the instructions in the Engine Owner’s Manual.

WARNING

Engine parts must be kept clean to reduce the risk of overheating and igni- tion of accumulated debris. This espe- cially important if cutting tall grass. Clean accumulated debris at each refuel- ing and before each use of the machine.

Failure to comply can cause injury or property damage.

A

Figure 5-10