Service manual

PRESTO OWNER’S MANUAL Page 9 WP & WPS Series Work Positioners
S E C T I O N 5
MAINTENANCE
A. INSTRUCTIONS:
• Grease wheels and casters at least once a
month to maintain easy roll of lift.
• Use only Hydraulic Oil (Conoco Super Hy-
draulic 32 or equivalent) in the hydraulic sys-
tem. NEVER USE HYDRAULIC BRAKE
FLUID.
• Do not overload your lift.
B. MONTHLY MAINTENANCE CHECKS:
1. Battery
• Clean terminals.
• Clean battery compartment area.
• Check specic gravity -- fully charged battery
should read 1265.
• Check uid level in all cells. Fill with
distilled water as necessary to bring uid to
within ¾” of the top.
2. Hydraulic System
• Clean and inspect hydraulic cylinder.
• Lubricate chains with a rust inhibitive chain
lubricant.
• Check chain tension. The chains should be
tight enough so that they do not come off the
chain roller assembly. The tension should
be adjusted so that the chains bear equal
amounts of load weight.
3. Frame Assembly
• Clean and lubricate all roller bearings and
cam followers.
• Clean and inspect all welds.
• Check wheels for wear and damage.
• Inspect nameplate for legibility. Place the se-
rial and model number shown on the name-
plate on the cover of the manual for future
reference.
S E C T I O N 6
SERVICE
IF LIFT DOES NOT RISE TO FULL HEIGHT
-- check for leaks or shortage of oil. Maintain the
proper oil level.
IF THE LIFT TENDS TO CREEP DOWNWARD
UNDER A LOAD -- a speck of dirt may be
obstructing the seating of the valve and allowing
leakage. To correct, follow these instructions:
• Raise lift to full lifting height and then lower
it to lowest point of lift. It may be necessary
to do this ve or six times. In lowering the
lift, lower it in stages, that is, lower the lift
six inches to a foot at a time. This will dis-
lodge the dirt and lift will operate properly.