J&M PRO 450 - Manual (Page 14)

14
SERVICE
2.4 Hydraulic Power Unit
Daily (every 5 hours of use):
1. Check oil level.
2. Inspect for oil leaks and repair as necessary.
3. Check all hoses, fittings, bolts and hardware to make sure that they are secure and properly tightened.
4. Check motor oil level. See Engine operator’s manual for details on oil levels, oil types, and service
intervals.
Once per season (every 20-25 hours of use):
Change hydraulic oil filter element with either a NAPA 155Z or a FRAM P1654A Filter.
Every two to three years (every 75-80 hours of use):
Drain oil reservoir and refill with clean, good quality hydraulic AW 32 oil. (It is not recommended to refill
with tractor hydraulic oil).
Replacing hydraulic parts:
Check parts section for proper part description and part # for replacement.
Purge air from system as follows:
1. Disconnect the rod end clevis of all cylinders in a circuit and block up cylinders so the rod can completely
extend and retract without contacting any other components.
2. Pressurize the system and maintain system at full pressure for at least 5 sec. after cylinder rods stop
moving. Check that all cylinders have fully extended or retracted.
3. Check hydraulic reservoir and refill as needed.
4. Pressurize system again to reverse the motion of step 2. Maintain pressure on system for at least 5 sec.
after cylinder rods stop moving. Check that cylinders have fully extended or retracted.
5. Check for hydraulic leaks using cardboard or wood. Tighten connections according to the
torque chart. (pg.23)
6. Repeat steps 2, 3, 4 and 5 (3 to 4 times).
7. Depressurize hydraulic system and connect cylinder rod clevises to their mating lugs.
2.5 Electric Brakes
The Speed Pro is equipped with electric brakes. They need to be inspected and serviced immediately if a loss of
performance is experienced. You need to service your Speed Pro brakes at least once a year with normal use.
How to use your electric brakes properly:
Your Speed Pro brakes are designed to work in synchronization with your tow vehicle brakes. Never use your
tow vehicle or Speed Pro brakes alone to stop the combined load.
Your Speed Pro and tow vehicle will seldom have the correct amperage flow to the brake magnets to give you
comfortable, safe braking unless you make proper brake system adjustments. Changing trailer load and driving
conditions, as well as uneven alternator and battery output, can mean unstable current flow to your brake mag-
nets. It is therefore imperative that you maintain and adjust your brakes as set forth in this manual, use a properly
modulated brake controller, and perform the synchronization procedure noted below.
In addition to the synchronization adjustment detailed below, electric brake controllers provide a modulation
function that varies the current to the electric brakes with the pressure on the brake pedal or amount of deceler-
ation of the tow vehicle. It is important that your brake controller provide approximately 2 volts to the braking
system when the brake pedal is first depressed and gradually increases the voltage to 12 volts as brake pedal pres-
sure is increased. If the controller “jumps” immediately to a high voltage output, even during a gradual stop, then
the electric brakes will always be fully energized and will result in harsh brakes and potential wheel lockup.