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Test Procedure
1. Start engine and run for 5 minutes at 3/4 throttle, to
warm hydraulic fluid.
2. Drive the machine to a clear and level open area such
as a driveway.
Important
There should be at least 10 feet of clear
area in front of the machine.
3. Loosen the quick release levers and push the reference
bar forward to the "FAST" position. Lock the quick
release levers to secure the reference bar.
4. Move throttle control to 3/4 throttle.
5. Quickly push the upper control bar against the
reference bar. The front caster wheels should almost
lift off the ground. If front caster wheels lift the off the
ground , the machine is too aggressive and adjustment
is required.
6. Move the engine throttle to the "FAST" position.
7. Quickly push the upper control bar against the
reference bar. The front caster wheels should lift
approximately 1 inch off the ground. If front caster
wheels lift the off the ground more than 2 inches, the
machine is too aggressive. Adjustment is required.
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.
Adjustment Procedure
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 in. (132 cm) 1/2 turn out
44 in. (112 cm) 1 turn out
36 in. (91 cm)
1–1/6 turn out
1. Loosen large jam nut several turns (Fig. 37).
2. Gently close by–pass valve (Fig. 37).
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 (Fig. 37).
4. Tighten jam nut to lock the adjustment (Fig. 37).
5. Repeat "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.
All manuals and user guides at all-guides.com
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 "Test Procedure" to check for proper operation.
Re-adjust the by–pass valves until proper performance
is achieved.
1
1. By-pass valve
Adjusting Neutral
If wheels turn when control bar is in neutral, adjustment is
required
1. Raise rear of the machine so wheels are off the ground
and support with jack stands.
Children or bystanders may be injured if they
move or attempt to operate the machine while it is
unattended.
Always remove the ignition and chock or block
tires when leaving the machine unattended, even
if just for a few minutes.
2. Start engine and run for 5 minutes at 3/4 throttle, to
warm hydraulic fluid.
3. Move control bar rearward and forward then release. If
wheels rotate when control bar is in neutral,
adjustment is required.
4. Loosen top and bottom jam nuts at pump arm neutral
adjustment sleeve (Fig. 38).
34
Figure 37
2. Jam nut
Caution
2
m–5209
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