Dawson HPH 1200, User Manual

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6.0 TROUBLESHOOTING
6.1 Power pack engine will not start
a. Check battery condition.
b. Check diagnostics panel for fault LED showing (see fig. 2.)
6.2. Engine cuts out during running
a. Check diagnostics panel for fault LED showing and rectify (see fig. 2.)
6.3. Power pack does not generate any pressure
a. Check L.E.D. (12) to see if hydraulic oil is up to temperature (see figure 2). If not perform
warm-up operation described in section 3.3.1.
b. Check operation of main valve in power pack by turning selector switch (13) to ‘warm-up’ on
the instrumentation panel (fig. 2.) This gives 200 bar reading on pressure gauge.
c. Check fuses or electrical connections to valve block if no reading from (b).
d. Check operation of relief valve if no reading from (b).
e. Check operation of hand control pendant and fuses in electrical box if reading is
O.K. in (b).
6.4. Power pack generates pressure but hammer does not run
a. Anvil not pushed fully up into hammer casing (see section 3.4.1.) or the dolly is not sitting
correctly in the anvil (especially after transportation or laying on its side - see also section 1.2).
b. Check oil flow rate gauge reading - 75 l/min minimum. (Note: this figure will be much higher
whilst the hydraulic oil is cold).
c. Air in hammer hydraulic system - see section 3.4.2.
d. Hammer has been allowed to overtravel - see section 3.4.4. to reset.
e. Damaged hose on control side of hammer - check by removing front leg guide for inspection.
f. Faulty bottom sensor assembly - lay the hammer on timber blocks on level stable ground on its
rear leg guide then remove front leg guide and check bottom sensor as follows:-
(i) Cam/spring operation - does the cam rotate/return freely and is the spring in good order.
(ii) Check for correct lift on valve roller (4mm)
(iii) Check 'trip' arrangement for correct function (part 1-083-00-05 & 1-36-00-05)