DR Power Z-Mower 19.5 HP Versa-Pro - Manual (Page 41)

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Adjusting the Hydro Tracking
WHEN PERFORMING ANY ADJUSTMENT OR MAINTENANCE, YOU MUST FIRST SHUT OFF THE ENGINE,
SET THE PARKING BRAKE, WAIT FIVE (5) MINUTES TO ALLOW PARTS TO COOL AND DISCONNECT THE
SPARK PLUG WIRE(S), KEEPING IT AWAY FROM THE SPARK PLUG(S).
The amount of tension on the Chain determines the amount of “play” or “slack” in the in the Control
Handle travel. To insure equal response from both Control Handles, the tension on each Chain should
be equal. If the machine is not tracking straight, perform the following adjustments:
DO NOT OVER TIGHTEN THE CHAIN. THIS CAN CAUSE THE CONTROL LEVERS TO JAM IN THE FORWARD
OR REAR POSITION.
Tools Needed:
• 1/2", 9/16", 7/16" & 3/8" Wrenches
•
Pliers
•
Masking Tape and Tape Measure
Check the Linkage Chain Tension
1. Place the Control Arm in the Walk-Behind position. Remove the Chain
Guard from the Control Arm (Figure 24).
2. Viewing the Chains (Figure 25) from the Operator Position, the Left Chain
controls the Right Control Handle, and the Right Chain controls the Left
Control Handle. Loosening the Chain will increase the amount of slack in
the Chain, tightening will decrease the amount of slack in the Chain.
3. Apply a short length of tape along the top of each Control Handle and
draw a reference line for use in measuring in steps 4 and 5 below.
4. Bring the Speed Control Bar to the vertical position. Using light hand
pressure, move one Control Handle forward (Figure 26) until you feel
resistance. Using a tape measure, note the distance between the Speed
Control Bar and Control Handle.
5. Gently move the Control Handle backward until you feel resistance again.
Note the distance from the Speed Control Bar.
6. The difference in the two (2) measurements is an indication of the
amount of slack in the Chain and the “Dead Zone” between Forward and
Reverse.
7. Repeat Steps 3 and 4 for the other Control Handle.
8. Using a 3/8" Wrench and Pliers, loosen the Nut on the Turnbuckle for the
Control with the greatest “Dead Zone”. Adjust the Turnbuckle and re-
measure until the tension is equal on both Control Handles. Re-tighten
the Nut.
9. Check the full travel of each Control Handle to be certain it does not stick
or jamb in any position.
10. Replace the Chain Guard and return the Control Arm to the Ride position.
Figure 24
Figure 25
Figure 26
Step 4.
Step 5.
Dead Zone