Tray Support · NPR Australia
Tray Support: tray support for mining haul trucks
Tray Support is a dump body support block that sits between the chassis and the raised tray so your crew works underneath on a dedicated support, rated 30 kg per cm² of contact. One size per CAT, Komatsu, Hitachi, Terex and Liebherr truck model. Made by NPR in Australia, distributed in Peru by Endeavant.
Why Tray Support
A dedicated support to work under the raised tray
The Tray Support block sits between the chassis rail and the tray rail, and is designed only to support dump bodies. Each size has a documented load calculation, so your maintenance crew stops guessing how to hold the tray. The full guide is in tray support for haul trucks.
- Safe access under the trayA dedicated support while the crew works with the tray raised.
- Hoist cylinder changesThe tray rests on the blocks, not on the cylinders.
- Several jobs at onceSeveral maintenance jobs can run at the same time.
- Light, with a handle11 to 34 kg depending on size, with a handle to position it.
Compatibility guide
One size for each truck model
Each Tray Support size was designed for one haul truck model: Size 01 for Caterpillar 793, 789, 785, 777 and 730, Size 02 for Komatsu 830E and 930E, Size 07 for the CAT 797. The table is a guide: always confirm compatibility with your equipment before use.
| Size | Part no. | Make and series | Weight |
|---|---|---|---|
| Size 01 | NPR06253-00 | Caterpillar 793, 789, 785, 777, 730 | 18.5 kg |
| Size 02 | NPR05233-00 | Caterpillar 793 (wide chassis rail) · Komatsu 830E, 930E | 24 kg |
| Size 03 | NPR06358-00 | Terex MT4400 · Liebherr T282C | 21.5 kg |
| Size 05 | NPR07087-00 | Caterpillar 795 | 20 kg |
| Size 06 | NPR07226-00 | Caterpillar 793 | 11 kg |
| Size 07 | NPR07678-00 | Caterpillar 797 | 20.5 kg |
| Size 09 | NPR08172-00 | Caterpillar 789 (specific) | 16 kg |
| Size 10 | NPR08264-00 | Caterpillar 796 | 29 kg |
| Size 11 | NPR08749-00 | Hitachi EH5000 | 23 kg |
| Size 14 | NPR08542-00 | Komatsu HD1500, HD785 | 18 kg |
| Size 16 | NPR08531-00 | Hitachi EH4000 | 15 kg |
| Size 17 | NPR08584-00 | Liebherr T264 | 34 kg |
Many trucks have manufacturing variations and many replacement trays vary in weight and size, so the manufacturer does not guarantee fit by model. We help you check your truck and tray dimensions.
The blocks
Eight of the twelve sizes, marked TOP / FRONT
Each Tray Support block carries its size and install orientation (TOP / FRONT) marked on it, plus a handle to position it. It weighs 11 to 34 kg depending on size. All twelve sizes are in the NPR catalogue.
Size 01
CAT 793 · 789 · 785 · 777
Size 02
Komatsu 830E · 930E
Size 03
Terex MT4400 · Liebherr T282C
Size 05
CAT 795
Size 07
CAT 797
Size 10
CAT 796
Size 14
Komatsu HD1500 · HD785
Size 17
Liebherr T264
Load calculation
Capacity comes from the contact area with each rail
A Tray Support's capacity is the contact area of the narrower rail (cm²) × 30 kg. Chassis and tray rails must sit parallel to the block faces for full contact.
Set-up data
Angle, pivot distance and capacity per size
As a guide, each Tray Support size has a chassis-to-tray angle (3° to 13°) and a distance from the back of the block to the pivot. Real capacity depends on the contact area of your truck's rails.
| Size | Part no. | Chassis–tray angle | Block to pivot | Min. contact | Capacity (example) |
|---|---|---|---|---|---|
| Size 01 | NPR06253-00 | 7° | 3.2 m | 20 × 35 cm | 21 000 kg |
| Size 02 | NPR05233-00 | 7° | 3.3 m | 29 × 35 cm | 30 450 kg |
| Size 03 | NPR06358-00 | 7° | 3.3 m | 32 × 30 cm | 28 800 kg |
| Size 05 | NPR07087-00 | 5.4° | 4.7 m | 22 × 35 cm | 23 100 kg |
| Size 07 | NPR07678-00 | 3° | ≈ 3.84 m | 10 × 116 cm | 34 800 kg |
| Size 09 | NPR08172-00 | 7° | 3.3 m | 20 × 30 cm | 18 000 kg |
| Size 10 | NPR08264-00 | 10.43° | 3.2 m | 20 × 35 cm | 21 000 kg |
| Size 14 | NPR08542-00 | 7° | 4 m | 25 × 36 cm | 27 000 kg |
| Size 17 | NPR08584-00 | 13° | 3.3 m | 20 × 30 cm | 18 000 kg |
Values from NPR user guide BRO-A-158 (example 1 of each size). Always calculate capacity with your own rails. For Size 06, ask us for the set-up data.
Safe use
Six rules before lowering the tray onto the block
These six Tray Support safe-use rules come from the NPR user guide and apply to every size: risk assessment, inspection, temperature, load, even bearing and lowering the tray.
Risk assessment
Complete one for each application, per your site requirements.
Inspect each block
If it shows any damage, discard it.
Block temperature
Between −50 and +40 °C. Block temperature, not ambient.
Know the load
Calculate the load area and check the capacity covers it.
Even load
Even, never point load, with rails parallel to the faces.
Lower gently
An impact can exceed capacity and damage the block.
In the field
Installed between chassis and tray
Tray Support is positioned with its handle and, with the tray resting on it, the crew works underneath on a dedicated support. In the workshop it pairs with MineChock™ wheel chocks to secure the wheels and Stacko™ towers to support components.
FAQ
Tray Support FAQ
What is a Tray Support block?+
Which Tray Support size do I need for a CAT 793?+
Which size fits Komatsu, Hitachi, Terex or Liebherr trucks?+
How much load does a Tray Support block hold?+
How many Tray Support blocks are used per truck?+
Why not leave the tray resting on the hoist cylinders?+
What care is needed when lowering the tray onto the block?+
Where can I buy Tray Support in Peru?+
Quote by truck model
Quote Tray Support for your fleet
Tell us the make and model of your trucks. We check the size against your rail dimensions and send you the quote and data sheet.
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