Section II. MAINTENANCE AND REPAIR INSTRUCTIONS

10-3990-200-12&P

k. P u s h a n c h o r p i n s N o . 5 8 - 6 , w i t h 5 8 - 1 0 a t -

TEMPT TO FORCE FULL RETURN.

t a c h e d , to a return position. Caution: pins will not

l. R a m p i s n o w r e a d y f o r l o a d i n g - u n l o a d i n g

return fully due to safety device incorporated to

operation.

assure proper transport condition. DO NOT AT-

Section

II.

MAINTENANCE

AND

REPAIR

INSTRUCTIONS

3-3. Oil Reservoir

3-7. Tire Inflation

The correct air pressure for the 21" x 6.90 10 ply

Keep the oil reservoir (located at the top of the

pneumatic tires is 100 lbs. Be sure to release all air

pump) filled with #10 W high-detergent motor oil or

hydraulic fluid. Do not use brake fluid as it dissolves

from the tire before attempting tire removal.

the sizing in the packing and will result in ram

3-8. Wheel Bearings

leakage. To prevent damage to the pump and over-

The wheels have been packed at the factory with

flowing, fill the oil reservoir only when the ramp is in

waterproof automotive grease. They should be

the lowered position.

greased moderately every six months by manual

3-4. Line Bleeding

repacking. Care should be taken not to overfill with

grease as this could cause a pressure buildup which

After filling the oil reservoir it will generally be

might rupture the bearing seals.

necessary to bleed the hydraulic system of air.

Slightly loosen the line nut at one of the rams and

3-9. Wheel Nuts

pump slowly until all traces of air in the oil disap-

The wheel nuts are torqued to 85-95 ft-lbs. when

pears. Tighten the line nut and refill the reservoir. It

installed at the factory. If any maintenance is

m a y be necessary to repeat this operation several

r e q u i r e d that removes the wheels this 85-95 ft-lbs.

times to completely remove air from the system.

t o r q u e must be achieved in the reassembly of the

3-5. Pump Overload valve

wheel nuts.

The pump overload adjustment has been set at the

3-10. Coil Spring Suspension System

factory to maintain the ramp in an elevated position

Spring & Pilot Assembly support rod No. 58-5 to be

when there is no load on the ramp. Should the ramp

lubricated externally at all pivot points with a good

have a tendency to settle, this may be corrected by

grade oil and kept free of road dirt to enable unit to

turning the overload valve adjustment set screw

fall freely. Spring Pilots No. 58-1. and -2 to be

one-quarter turn clockwise to increase the relief

g r e a s e d with a cup or fiber grease to permit free

pressure. Remove the six cover bolts and cover the

s l i d i n g and minimize possible rust. Drain hole on

top of the pump to locate the adjustment screw.

b o t t o m of lower pilot No. 58-1 to be kept free of

3-6. Pump Removal

road dirt, ice, and all foreign matter. Springs can be

r e m o v e d for inspection or replacement by allowing

It is recommended that the pump be removed and

Spring & Pilot Assembly to drop free as explained in

returned to the factory for servicing. First

O p e r a t i n g Instructions. Lift out upper Spring Pilot

disconnect the line to the ramp at the pump. Service

A s s e m b l y and lift springs off lower pilot. Locator

charges are commensurate with repairs required.

saddle should be kept clean and free of road dirt, ice,

Exchange pumps should be ordered at once to

o r any foreign matter which may be a deterent to

r e d u c e "down time".

proper alignment of anchor pins No. 58-6.

3-3