4.6 Failure diagnoisis
&
solutions
phenomenon
Bad brake
Brake noise
Uneven brake
Possible reason
a.Brake system leaks oil.
b.There is air in brake system.
repair
Release air
solution
adjusted correctly.
c.Gap between brake shoes is not
Adjust regulator
d.Brake is overheated.
Check if slip
e.Poor contact between brake drum
and friction plate.
readjust
f. There are impurities on friction plate. Repair or change
g.Impurities are mixed into brake fluid. Check brake liquid
h.Brake pedal (inching valve)
improperly adjusted.
is
adjust
a. The surface of friction plate is
Repair or change
hardened or there are impurities on it.
b.Baseplate is deformed or bolts are
loosened.
Repair or change
c.Brake shoes are deformed
installed incorrectly.
ct.Friction plate is worn
e. Wheel bearing is loose.
or
Repair or change
Change
Repair
a. There is oil stain on the surface of
Repair or change
friction plate.
b. Gap between brake shoes is not
Adjust regulator
adjusted correctly.
c. Wheel cylinder is out of order.
Repair or change
d.Return spring of brake shoe is
Change
damaged.
e.Brake drum deflects.
Repair or change
109
V. Hydraulic System
5 .I Technical data
Main
oil
pump
Multi
-way
valve
Speed
limit
valve
Forklift model
model
type
d1iving
Rated displacement ( ml/r)
pressure (rated/max.) Ps
i
speed Cr/min)
type
Main safety valve pressure (MPa)
Rated flow (L/min)
l
pressme
( MPa )
Distributing valve
l
flow (Umin)
model
5.2 Overview
60hp 2.4L PSI
Ranko R55 Forklift
Gear type
Engine power output gear driving
32
2
9
00/3600
400-3000
Double-side valve type, with overflow
distributing valve and front-tilt
self-locking valve
8-20(already set when leaving factory)
80
11-13
XSF-Fl61-3T
Hydraulic system consists of main oil pump, multi-way valve, lifting cylinder, tilt cylinder and
oil line. The main oil pump is directly drived by engine power output device.
5.3
Main oil pump
The main oil pump is a gear pump which consists of pump body, pmnp cap, a pair of bearing and
seal ring. It uses load-balance type bea1ing and special lubrication method to make the gear end face
gain the smallest interval.
At one side of the starting shaft, there is a oil seal on the pump body to keep the sealing
perfonnance. The sealing between pump body and pmnp cap relys on special-shaped seal 1ing.
110
Ranko R55 Forklift
Operator's Maintenance Manual
Common Faults & Solutions
Ranko R55 Forklift
Operator's Maintenance Manual
Common Faults & Solutions