Step 13: Hydraulic System, Purging - Snapper Zero Turning Z-Riding Set-Up Instructions & Pre-Operation Checklist Manual

STEP 13: HYDRAULIC SYSTEM, PURGING

When initially putting hydraulic system into service, one or
both of the wheel drives may not pull properly. This is
likely to be caused by air entrapped in the system. If you
experience a pulling issue during initial setup or after com-
pleting repairs, perform the following procedure to purge
the air from one or both of the hydraulic drive systems.
IMPORTANT: WHEN REPLACING THE HYDRAULIC
FLUID FILTER, PRE-FILL WITH OIL (SAE 20W50 API
SL) BEFORE INSTALLING. PRE-FILLING THE FILTER
WITH OIL WILL REDUCE OR POSSIBLY ELIMINATE
THE NEED TO PURGE THE SYSTEM OF ENTRAPPED
AIR.
A. Locate hydraulic reservoir underneath operator's
seat. After thoroughly cleaning the area around the top
of each reservoir, remove filler cap. Bring fluid to
proper level (1 ½" below the top of the filler neck). With
engine off, add SAE 20W50 automotive oil. See
Figure 7.
B. Open pressure relief valve on hydraulic pump, turn-
ing counter clockwise 2 full turns. See Figure 8.
C. Carefully raise the rear of the machine so the
wheels are off of the ground. Securely block the
machine to prevent it from falling.
D. While seated in the operator's position, start the
engine. Place engine speed control in FAST position.
E. Release parking brake and move motion control
levers out of the neutral lock position.
F. Slowly move motion control levers to the full forward
and then to the full reverse positions. Repeat this
process 6 times.
G. Stop engine and wait for all rotation to stop before
leaving the operator's position.
H. Close pressure relief valve on hydraulic pump, turn-
ing clockwise. Tighten snuggly.
I. With pressure relief valve closed, repeat Steps D
thru G.
J. Remove blocks and lower rear of machine.
K. Check fluid level in reservoir. Add SAE 20W50
automotive oil as required to bring fluid level to 1 ½"
from top of filler neck. Do Not over fill.
L. Install and tighten filler cap.
ROTATE RELIEF VALVE
COUNTERCLOCKWISE
TO RELIEVE PRESSURE
RELIEF
VALVE
4
HYDRAULIC
RESERVOIR
FIGURE 7
FIGURE 8