Maxon MTB 72-25C, Руководство по обслуживанию

Страница: 45 / 45

11921 Slauson
A
ve. Santa Fe Springs, CA. 90670 (800) 227-41
16 F
AX (888) 771-7713
PAGE 45
PLATFORM WILL NOT LOWER, LOWERS TOO SLOWLY,
OR LOWERS TOO QUICKLY
4. Check the Valve Stem by removing the Coil Assembly
(Item 1, FIG. 11) . With platform supported, unscrew the
Valve Stem (Item 2, FIG. 11) from the Pump. Push on the
plunger located inside the Valve Stem by inserting a
paper clip in the end. If the Plunger does not move
freely (approximately 1/8”) replace the Valve Stem.
5. Check if filtering screen on solenoid valve is plugged.
Clean carefully if required.
6. Check and clean Flow Control Valve in high pressure
hydraulic line attached to Cylinder.
7. Check if Flow Control Valve must point in the direction of
restricted fluid flow (back toward pump). If required,
remove Flow Control Valve and install it correctly.
CAUTION
Keep dirt, water and other contaminants from entering the hydraulic system. Before
opening the hydraulic fluid reservoir filler cap, drain plug and hydraulic lines, clean up
contaminants that can get in the openings. Also, protect the openings from accidental
contamination during maintenance.
NOTE: In most cases, you can avoid having to bleed the hydraulic system by correctly
positioning Liftgate Platform before opening hydraulic lines. Refer to following procedure.
Save time on the job and prevent accidental fluid spills and hazards.
FIG. 11
1. Use voltmeter to verify that power is being supplied to
Solenoid Terminal “A”. Recharge the battery if voltmeter
indicates less than 12.6 Volts
( FIG. 9) .
2. Check for structural damage or poor lubrication.
Replace worn parts.
3. Check if Solenoid Valve is getting power by holding a
screwdriver against the top nut of the Solenoid. Push Control
Switch to
“LOWER” position to energize solenoid (FIG. 10) . A
good solenoid will attract (magnetically) the screwdriver to the nut
and make it difficult to pull the screwdriver away from the nut.
FIG. 9
TERMINAL
“A”
COIL
FIG. 10
2
1/8”
1