Bush Hog MID MOUNT ZERO TURN SERIES Operator's Manual download pdf (Page 19)

WARNING

HIGH PRESSURE HYDRAULIC FLUID LEAKS

CAN PENETRATE SKIN CAUSING SERIOUS

INJURY AND GANGRENE.

INJECTED FLUID MUST BE SURGICALLY

REMOVED WITHIN A FEW HOURS BY A DOC-

TOR FAMILIAR WITH THIS TYPE OF INJURY.

TO AVOID SERIOUS INJURY FROM

PRESSURE LEAKS:

● USE CARDBOARD AND NOT HANDS TO

SEARCH FOR LEAKS.

● RELIEVE HYDRAULIC PRESSURE BEFORE

WORKING ON SYSTEM.

● CHECK HYDRAULIC HOSES, LINES, AND

CONNECTIONS FOR TIGHTNESS AND

GOOD CONDITION BEFORE APPLYING

SYSTEM PRESSURE.

START-UP MAINTENANCE

HYDROSTATIC FLUID

Bush Hog recommends the use of 20W50 motor oil

in the hydrostatic reservoir.

START-UP PROCEDURE

The following start-up procedure should always be

followed when starting a new installation or when

restarting and installation in which the pump or

motor has been removed from the system.

Prior to starting the pump, make certain all system

components (reservoir, fittings, etc.) are clean prior

to filling with fluid.

Fill the reservoir with recommended fluid which

should be filtered prior to entering the reservoir.

Start the engine and idle at the lowest possible RPM.

With the bypass valve closed, slowly move the dis-

placement control in both the forward and reverse

directions. As air is purged from the unit, the oil level

in the reservoir will drop and bubbles may appear in

the fluid. Refill the reservoir as necessary.

Place the steering levers in the neutral position and

WARNING

TO AVOID INJURY FROM EQUIPMENT GROUND

TRAVEL AND MOVEMENT DURING

START-UP PROCEDURE:

DO NOT START OR JOG ENGINE UNTIL:

● PUMP IS IN NEUTRAL POSITION

● DRIVE WHEELS ARE RAISED OFF THE

GROUND.

● EQUIPMENT IS SECURELY BLOCKED-UP TO

KEEP WHEELS FROM GROUND CONTACT.

● PTO AND OTHER WORK FUNCTIONS ARE

DISCONNECTED.

● KEEP HANDS, HAIR AND CLOTHING AWAY

FROM ROTATING BLADES.

open the bypass valve. Slowly move the steering

levers in both the forward and reverse directions to

purge the air from the closed circuit.

Close the bypass valve and run the unit in both direc-

tions for several minutes until any remaining air is

purged from the unit. Refill the reservoir as necessary.

Stop the engine, check for and correct any fluid leaks,

and check the reservoir level. Add fluid if necessary.

The transmission is now ready for operation.

HYDROSTATIC MAINTENANCE

Check the reservoir daily for proper fluid level.

The pump and motor units normally do not require

regular fluid changes. The system filter should be

changed after the first 50 hours of break-in, then

every 250 hours thereafter. The fluid and filter should

be changed and the system cleaned if the fluid

becomes contaminated with foreign matter (water,

dirt, etc.).

PARKING BRAKE ADJUSTMENT

Check to make sure brake is adjusted properly.

Force on the brake handle to lock the brake in place

should be 20 pounds. To adjust the brake tension,

shorten or lengthen the horizontal brake linkage.

If further adjustment is needed at each individual

wheel brake:

1. Engage the brake lever (lever up).

2. Remove the wheel from the side needing adjusting.

3. With the brake engaged the spring length should

be 3-1/2” (measured to the inside of the spring loops).

4. If the spring length is different, shorten or lengthen

the vertical brake linkage.

5. Reinstall the wheel and torque the lug nuts.

Pump Drive Belt Tension Adjustment

1. Stop engine and remove key.

2. The pump drive belt tension is adjusted through a

spring loaded idler pulley.

3. Locate the eye-bolt attached to this idler spring.

The eye-bolt threads should protrude 11/16” past the

nut. If adjustment is needed tighten or loosen the eye-

bolt to increase or decrease the spring tension, then

lock the front and rear nuts in place.

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Bush Hog MID MOUNT ZERO TURN SERIES Operator's Manual Page 19

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