Wright Manufacturing 4219 How to Test the Operator Presence Control OPC Switch, Height-of-Cut

both feet firmly on the foot platform and turn on the blade clutch switch. Run blades for a minute or so. Try engaging and disengaging the blades a few times about 10 seconds apart. If the blades do not start and stop in a few seconds each time, inspect the clutch or contact your local Wright dealer. Under mowing load, the clutch’s life will be the greatest at the highest RPM setting.

How to Test the Operator Presence Control

(OPC) Switch

With the parking brakes applied and the blades ON, try lifting your feet off the foot platform to test the Operator Presence Control switch (OPC). The engine should kill and the blades should stop within a few seconds. If not, service the OPC system or contact your local Wright dealer.

WARNING

Service and Adjustments

Tire Maintenance and Pressure

Excessively worn tire tread is dangerous on all hills. Replace drive tires with less than 3/32” of any tread groove left. Use tires with the tread pattern recommended by Wright Mfg., Inc. only. Keep the tire pressure in the drive tires between 18 and 24 psi. Higher pressures will cause the tires to have less traction which will force you to go slower and with less safety and give you a harder ride. Front Casters are equipped with non-pneumatic tires and do not required any air. They do not have any tread but should be replaced when excessively worn.

Height-of-Cut

Before adjusting the height-of-cut be sure the mower blades are not spinning, and all four tires have proper air pressure. Check for even tire wear. The height-of-cut can be adjusted the following ways:

•Pull the deck lift lever on the right hand side of the mower towards the rear of the mower until it clicks once into the locked transport position. Then set the mower blade height with the selector pin on the left hand side of the mower. Once the proper height setting is set on the left, pull back on the deck lift lever on the right hand side and then lower the lever towards the front of the machine until it stops at the set height of cut.

Deck Adjustments

The mower deck can be adjusted for pitch and side- to-side lever. Pitch is the relationship between the front of the deck and the rear of the deck in regards to height of cut. In most cases, a positive pitch (front of the deck lower than the rear of the deck) of ¼” is the optimum setting. These two adjustments can easily be made by using the deck lift rod assemblies attached to the front deck arms and the threaded deck hangers located at the rear of the deck frame.

These hangers are connected to the chains that

hold the deck. Adjust the rear deck hangers (by using a socket through the hole above the toe area of the platform) to achieve a ¼” pitch. These hangers are right-handed threads. If you raise any of these settings above the factory setting, the deck may not raise all the way up into transport position. Be sure and check the deck height of cut range after any adjustments are made to these hangers to ensure that the height of cut adjustments work properly. If unable to make the adjustments needed by only using these hangers, contact your dealer for assistance.

Belt Tension Adjustment

The pump drive belt is self-adjusting, and requires no adjustment, just replacement. The blade drive belts are self-adjusting also and require no adjustment, just replacement.

Deck Lift Spring Adjustment

To adjust deck spring tension, tighten or loosen the eye-bolt Nylock jam nut located in the front tank bracket. If tightening for more lift assist make sure not to over tighten creating the deck to hop over rough terrain.

Spring platform Adjustment

The factory setting is both springs set at the most forward position. The more rearward the spring position, the stiffer the platform gets. Adjustment will be to preference of feel. The two adjustment springs should at all times, be positioned next to each other not one forward or back more than the other. To adjust, loosen each spring retaining bolt from the top just enough to slide it, then tighten with impact wrench. The nut may spin using hand wrench. NOTE, do not loosen too much, if the nut falls off, the foot platform will have to be removed to reinstall. There is an extra hole for a third spring for operators heavy enough to bottom out the duel spring stock set up.

Oil Cooler Screen Removal and Cleaning

Your Stander ZK is equipped with an oil cooler, the oil cooler debris screen will need to be cleaned several times a day. Clean more often in bush hog conditions. To clean, “STOP ENGINE” lift thigh pad for access, either wipe screen or remove screen for cleaning. To remove screen, lift and rotate spring locks to free the screen. The screen is bowed to prevent a rattle and should be installed hump down, like a “U”. Using compressed air or water to clean may or may not be necessary.

Oil Cooler Removal and Cleaning

Clean oil cooler weekly. Clean more often in dry conditions. To remove oil cooler for a thorough cleaning “STOP ENGINE”, lift thigh pad for access. Loosen knob as far as necessary to slide the cooler back about 3/8 – 1/2" and then lift up and out. (The cooler knob does not need to be removed) Watch

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