Replacing The Traction Belt - Toro Proline 30187 Operator's Manual

8. If the machine accelerates slowly, and the front caster
wheels do not lift off the ground, the machine is too
un–responsive. Adjustment is required.
Adjusting the By–pass Valve
The by–pass valve should be adjusted to deliver best
performance for the size (weight) mower you have. The
by–pass valve factory setting is 1/2 turn out.
The following values can be used as initial settings for
different size mowers:
52 inch 1/2 turn out
44 inch 1 turn out
37 inch 1–1/6 turn out
36 inch 1–1/6 turn out
1. Loosen large jam nut several turns (Figure 32).
2. Gently close by–pass valve (Figure 32).
Important Do not over–tighten valve or needle and
seat may be damaged. Do not exceed 50 inch pounds to
close valve.
3. Open by–pass valve 1/2 turn (Figure 32).
4. Tighten jam nut to lock the adjustment (Figure 32).
5. Repeat the Test Procedure to check for proper
operation.
Important By–pass valve adjustment is very sensitive,
do not adjust more than 1/6 turn (one flat) at a time.
6. If the machine is too aggressive or tends to jump
forward, the valve needs to be opened further.
7. If the machine is slow to respond, the valve needs to be
closed further.
8. Repeat the Test Procedure to check for proper
operation. Re-adjust the by–pass valves until proper
performance is achieved.
1
Figure 32
1. By-pass valve

Replacing the Traction Belt

Check traction drive belt for wear after every 50 hours of
operation.
9. Raise the front of the machine and hold with jack
stands.
10. Disconnect in–line wire connector from wire harness to
electric clutch.
11. Remove mower drive belt; refer to mower Operator's
Manual.
12. Remove left front engine mounting bolt securing clutch
retainer to frame (Figure 33). Unhook retainer from
clutch and remove retainer.
13. Move idler pulley and remove traction belt from the
drive pulleys and clutch.
14. Install new belt around clutch and drive pulleys.
15. Hook clutch retainer into clutch and secure to frame
with engine mounting bolt. Torque engine mounting
bolt to 170-220 in–lb (19-24 NS m).
16. Connect clutch in–line wire connector to wire harness.
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2
1
m–3098
2. Jam nut