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Maintenance – Alamo RHINO 95C User Manual

Page 48

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MAINTENANCE

F-4145 01/11

Maintenance Section 5-6

© 2011 Alamo Group Inc.

MAINTENANCE

30. This valve is a precision device and is not intended for
extensive field adjustment or repair. Field replacement
parts are limited to seal kits, cartridges and tie rod ends.
Beyond replacement of these parts, opening of check
cavities and certain relief valve cavities to examine for
trapped dirt, or resetting main relief valve with the use of a
good pressure gauge, valve should be returned for service.

Dirt and shreds of packing material are the usual causes of
valve malfunction. Be sure that oil supply is kept clean. Use
only factory supplied packings in cylinder repair. Fittings
and hoses must be clean before being removed.

NOTE: Pay close attention to all caution warning notes so

valve will not have to be returned to manufacturer for

reconditioning.

Troubleshooting guide is designed to help qualified
individuals, with valve service training, correct minor
problems which may develop. If valve is under warranty do
not attempt disassembly for repairs. Contact your
authorized dealer. Any attempt to disassemble valve during
warranty period will VOID warranty.

15

Excessive back

pressure.

Restriction between “in”

and “out” port and

reservoir.

16

Paint on valve spool.

Sticking valve spool,

or scored valve.

Clean valve spool.

Binding may be caused

by over tightened plug,

mounting bolt, fitting or tie

rod bolt. See Item 30.

17

Oil leakage past

spool seal into spool

cap.

If spool cap contains oil,

replace spool seal o-ring.

If o-ring retainer is

“bellied”, check for

restriction from “out” port

reservoir. See Item 30.

18

Broken return

springs.

Replace broken return

springs.

19

Bent spool.

Return for factory repair

or replace with new spool

section. See Item 30.

20

Foreign particles.

Clean system and valve.

21

Misalignment of

control handle

linkage.

Check linkage for binding

condition.

22

Spool not moved to

full stroke.

Spool travel should be

5/16” either way or 5/8”

total.

23 Relief

valve

setting

in control valve too

low or defective.

Clean or overhaul relief

valve or replace cartridge.

Refer to VALVE

SERVICE section for

proper PSI settings.

24

Overload relief valve

in control valve

stuck open or

malfunctioning.

Clean relief. Do not

disturb pressure setting

or replace cartridge.

25

Worn control valve.

Replace control valve.

26

Check poppet in

control valve not

holding.

Clean check poppet(s)

carefully. Ensure free

movement and proper

seating or replace check

poppet. See Item 30.

27

Damaged or worn

spool seals.

Replace spool end seals.

28

Check ball in anti-

cavitation is stuck or

not seated properly.

Clean anti-cavitation

valve carefully. Assure

that checks move freely

and seat properly or

replace cartridge. See

Item 30.

29

Valve cap and

center return

mechanism binding.

Loosen screws holding

cap on valve (ref. Valve

Service image). Operate

valve spool and retighten

screws.

POSSIBLE CAUSE

CORRECTIVE ACTION