Isuzu JCR-ZZ Series
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I would like to introduce this type of bus by quoting the description in catalogue E820-BUS published in September 1981.
"As more and more cities come to rely on buses to help solve the problem of public transportation, Isuzu's JCR460ZZ and JCR500ZZ make more and more sense. Both feature a wide-track design with the front wheels set well back for better maneuverability and to allow for the installation of bodies with doors up front. In fact Isuzu offers bodies with a seating capacity of 44 or 48 passengers depending on the chassis. And as with most models in the line, chassis only can be ordered.
Among the standard features is the powerful Isuzu 6BD1 diesel engine, a proven performer under all climatic conditions. Other standard features include a 5-speed direct-drive transmission, a vacuum-assisted hydraulic brake system (front/rear independent) and a 140 liter fuel tank.
With the forward positioned engine, either chassis can be easily fitted with a locally built body. Available options include air assisted brake, an exhaust brake, and 200 liter fuel tank."
The buses described in this entries fall into Front Over Hang Long Type JCR-ZZ.
There were quite a few examples of JCR460ZZ in Hong Kong and Macau. Transmac SARL had 10 JCR460ZZs.
The JCR500ZZ was very rare in Hong Kong.
There are quite a few JCR500ZZs in New Zealand. Some operators still deploy them as tourist coaches.
Specifications of chassis (extracted from Isuzu Catalogue):
| Chassis Type | JCR460ZZ | JCR500ZZ |
| Overall length (mm) | 9090 | 9940 |
| Wheelbase (mm) | 4600 | 5000 |
| Front overhang (mm) | 1990 | 1990 |
| Rear overhang (mm) | 2500 | 2950 |
| Overall width (mm) | 2330 | 2330 |
| Overall height (mm) | 1990 | 1990 |
| Bus chassis weight (kg) | 3310 | 3360 |
| Maximum permissible gross vehicle weight (kg) | 12500 | 12500 |
| Weight front axle (kg) | 1955 | 1960 |
| Weight rear axle (kg) | 1355 | 1400 |
| Weight total (kg) | 3310 | 3360 |
| Maximum speed (km/h) | 96 | 96 |
| Final gear ratio | 5.571:1 | 5.571:1 |
| Engine | Isuzu 6BD1 diesel engine | |
| No. of cylinders | 6 | |
| Bore | 102 | |
| Stroke | 118 | |
| Engine capacity (litre) | 5.785 | |
| Engine power (kW @ rpm) | 110 @ 3200 | |
| Torque (Nm @ rpm) | 380 @ 2000 | |
| Air cleaner | Paper element with cyclone device | |
| Engine lubrication system | Pressure feed with full-flow paper element oil filter, oil cooler. | |
| Cooling system | Radiator; Tybe and corrugated fin, pressured type. | |
| Fuel system | Fuel injection pump: reformed Bosch in-line with mechanical governor. | |
| Fuel tank (litre) | 140 | |
| Clutch type | Dry single plate with damper springs | |
| Transmission | MBD5B 5-speed direct drive or overdrive synchromesh on 2nd, 3rd, 4th and 5th gears, floor mounted, remote control. | |
| Gear ratio 1st | 6.890:1 | |
| Gear ratio 2nd | 3.918:1 | |
| Gear ratio 3rd | 2.419:1 | |
| Gear ratio 4th | 1.466:1 | |
| Gear ratio 5th | 1.000:1 | |
| Gear ratio Reverse | 6.304:1 | |
| Tyres | 8.25-20-14PR | |
| Front axle type | Reverse Elliot, I-beam | |
| Front axle capacity (kg) | 5000 | |
| Front axle tread (mm) | 1920 | |
| Rear axle type | Banjo, fully floating, single reduction, hypoid gear | |
| Rear axle capacity (kg) | 9200 | |
| Rear axle tread (mm) | 1740 | |
| Service brakes type | Hydraulic with vacuum assisted, dual circuit, 2-leading and dual 2-leading on front and rear. | |
| Parking brakes type | Mechanical internal expanding at rear of transmission. | |
| Chassis frame type | Ladder type channel section. | |
| Suspension type | Semi-elliptical alloy steel leaf springs, hydraulic, double acting telescopic shock absorber at front and rear. | |
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Page created: 27 February 2005
Last updated: 8 July 2012